[Ord. No. 855 Art. I §§1 — 22, 9-24-1996]
Unless the context specifically indicates otherwise, the meaning of terms used in this Article shall be as follows:
BOD (denoting BIOCHEMICAL OXYGEN DEMAND)
The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five (5) days at twenty degrees centigrade (20°C), expressed in milligrams per liter.
BUILDING DRAIN
That part of the lowest horizontal piping of a drainage system which receives the discharge from soil, waste, and other drainage pipes inside the walls of the building and conveys it to the inner face of the building wall.
BUILDING SEWER
The extension from the building drain to the public sewer or other place of disposal.
COMBINED SEWER
A sewer receiving both surface runoff and sewage.
GARBAGE
Solid wastes from the domestic and commercial preparation, cooking and dispensing of food, and from the handling, storage and sale of produce.
INDUSTRIAL WASTES
The liquid wastes from industrial manufacturing processes, trade, or business as distinct from sanitary sewage.
NATURAL OUTLET
Any outlet into a watercourse, pond, ditch, lake or other body of surface or groundwater.
PERSON
Any individual, firm, company, association, society, corporation, or group.
pH
The logarithm of the reciprocal of the weight of hydrogen ions in grams per liter of solution.
PROPERLY SHREDDED GARBAGE
The wastes from the preparation, cooking and dispensing of food that have been shredded to such a degree that all particles will be carried freely under the flow conditions normally prevailing in public sewers, with no particle greater than one-half (½) inch (1.27 centimeters) in any dimension.
PUBLIC SEWER
A sewer in which all owners of abutting properties have equal rights, and is controlled by public authority.
SANITARY SEWER
A sewer which carries sewage and to which storm, surface and groundwaters are not intentionally admitted.
SEWAGE
A combination of the water-carried wastes from residences, business buildings, institutions, and industrial establishments, together with such ground, surface, and storm waters as may be present.
SEWAGE TREATMENT PLANT
Any arrangement of devices and structures used for treating sewage.
SEWAGE WORKS
All facilities for collection, pumping, treating and disposing of sewage.
SEWER
A pipe or conduit for carrying sewage.
SHALL
Is mandatory; MAY — is permissive.
SLUG
Any discharge of water, sewage, or industrial waste which in concentration of any given constituent or in quantity of flow exceeds for any period of duration longer than fifteen (15) minutes more than five (5) times the average twenty-four (24) hour concentration or flows during normal operation.
STORM DRAIN (sometimes termed "STORM SEWER")
A sewer which carries storm and surface waters and drainage, and unpolluted cooling water, but excludes sewage and industrial wastes.
SUPERINTENDENT
The Superintendent of Sewage Works and/or Water Pollution Control of the City of Rock Port, or his/her authorized deputy, agent, or representative.
SUSPENDED SOLIDS
Solids that either float on the surface of, or are in suspension in water, sewage, or other liquids, and which are removable by laboratory filtering.
WATERCOURSE
A channel in which a flow of water occurs, either continuously or intermittently.
[Ord. No. 855 Art. II §1, 9-24-1996]
It shall be unlawful for any person to place, deposit, or permit to be deposited in any unsanitary manner on public or private property within the City of Rock Port, or in any area under the jurisdiction of said City, any human or animal excrement, garbage, or other objectionable waste.
[Ord. No. 855 Art. II §2, 9-24-1996]
It shall be unlawful to discharge to any natural outlet within the City of Rock Port, or in any area under the jurisdiction of said City, any sewage or other polluted waters, except where suitable treatment has been provided in accordance with subsequent provisions of this Article.
[Ord. No. 855 Art. II §3, 9-24-1996]
Except as hereinafter provided, it shall be unlawful to construct or maintain any privy, privy vault, septic tank, cesspool, or other facility intended or used for the disposal of sewage.
[Ord. No. 855 Art. II §4, 9-24-1996]
The owner of all houses, buildings, or properties used for human employment, recreation, or other purposes, situated within the City and abutting on any street, alley, or right-of-way in which there is now located or may in the future be located a public sanitary or combined sewer of the City, is hereby required at his/her expense to install suitable toilet facilities therein, and to connect such facilities directly with the proper public sewer in accordance with the provisions of this Article, within sixty (60) days after date of official notice to do so, provided that said public sewer is within one hundred (100) feet (30.5 meters) of the property line.
[Ord. No. 855 Art. III §§1 — 8, 9-24-1996]
A. 
Where a public sanitary or combined sewer is not available under the provisions of Section 705.050, the building sewer shall be connected to a private sewage disposal system complying with the provisions of this Section.
B. 
Before commencement of construction of a private sewage disposal system the owner shall first obtain a written permit signed by the Superintendent. The application for such permit shall be made on a form furnished by the City, which the applicant shall supplement by any plans, specifications, and other information as are deemed necessary by the Superintendent. A permit and inspection fee of fifteen dollars ($15.00) shall be paid to the City at the time the application is filed.
C. 
A permit for a private sewage disposal system shall not become effective until the installation is completed to the satisfaction of the Superintendent. He/she shall be allowed to inspect the work at any stage of construction and, in any event, the applicant for the permit shall notify the Superintendent when the work is ready for final inspection, and before any underground portions are covered. The inspection shall be made within twenty-four (24) hours of the receipt of notice by the Superintendent.
D. 
The type, capabilities, location, and layout of a private sewage disposal system shall comply with all recommendations of the Department of Health of the State of Missouri. No permit shall be issued for any private sewage disposal system employing subsurface soil absorption facilities where the area of the lot is less than seven thousand two hundred (7,200) square feet. No septic tank or cesspool shall be permitted to discharge to any natural outlet.
E. 
At such time as a public sewer becomes available to a property served by a private sewage disposal system, as provided in Section 705.050, a direct connection shall be made to the public sewer in compliance with this Article, and any septic tanks, cesspools, and similar private sewage disposal facilities shall be abandoned and filled with suitable material.
F. 
The owner shall operate and maintain the private sewage disposal facilities in a sanitary manner at all times, at no expense to the City.
G. 
No statement contained in this Section shall be construed to interfere with any additional requirements that may be imposed by the Health Officer.
H. 
When a public sewer becomes available, the building sewer shall be connected to said sewer within sixty (60) days of notice of availability and the private sewage disposal system shall be cleaned of sludge and filled with suitable material.
[Ord. No. 855 Art. IV §§1 — 3, 9-24-1996; Ord. No. 1112 §§1 — 2, 12-19-2012]
A. 
No person shall uncover, make any connections with or opening into, use, alter, or disturb any public sewer or appurtenance thereof without first obtaining written permission from the Superintendent.
B. 
All costs and expenses incident to the installation and connection of a building's sewer shall be borne by the owner. The owner shall indemnify the City for any loss or damage that may directly or indirectly be occasioned by the installation of the building's sewer.
[Ord. No. 855 Art. IV §4, 9-24-1996]
A separate and independent building sewer shall be provided for every building; except where one (1) building stands at the rear of another on an interior lot and no private sewer is available or can be constructed to the rear building through an adjoining alley, courtyard, or driveway, the building sewer from the front building may be extended to the rear building and the whole considered as one (1) building sewer.
[Ord. No. 855 Art. IV §5, 9-24-1996]
Old building sewers may be used in connection with new buildings only when they are found, on examination and test by the Superintendent, to meet all requirements of this Article.
[Ord. No. 855 Art. IV §6, 9-24-1996]
The size, slope, alignment, materials of construction of a building sewer, and the methods to be used in the excavating, placing of the pipe, jointing, testing and backfilling the trench, shall all conform to the requirements of the Building and Plumbing Code or other applicable rules and regulations of the City. In the absence of Code provisions or in amplification thereof, the materials and procedures set forth in appropriate specifications of the American Society of Testing and Materials and the Water Pollution Control Federation Manual of Practice No. 9 shall apply.
[Ord. No. 855 Art. IV §7, 9-24-1996]
Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such building drain shall be lifted by an approved means and discharged to the building sewer.
[Ord. No. 855 Art. IV §§8 — 10, 9-24-1996]
A. 
The connection of the building sewer into the public sewer shall conform to the requirements of the Building and Plumbing Code or other applicable rules and regulations of the City, or the procedures set forth in appropriate specifications of the A.S.T.M. and the W.P.C.F. Manual of Practice No. 9. All such connections shall be made gastight and watertight. Any deviation from the prescribed procedures and materials must be approved by the Superintendent before installation.
B. 
The applicant for the building sewer permit shall notify the Superintendent when the building sewer is ready for inspection and connection to the public sewer. The connection shall be made under the supervision of the Superintendent or his/her representative.
C. 
All excavations for building sewer installation shall be adequately guarded with barricades and lights so as to protect the public from hazard. Streets, sidewalks, parkways, and other public property disturbed in the course of the work shall be restored in a manner satisfactory to the City and at the expense of the benefitting property owner.
[Ord. No. 855 Art. V §1, 9-24-1996]
No person shall discharge any stormwater, surface water, groundwater, roof runoff, subsurface drainage, including interior and exterior foundation drains, other sources of surface runoff or groundwater, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer.
[Ord. No. 855 Art. V §2, 9-24-1996]
Stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the Superintendent. Industrial cooling water or unpolluted process waters may be discharged on approval of the Superintendent, to a storm sewer, combined sewer, or natural outlet.
[Ord. No. 855 Art. V §3, 9-24-1996]
A. 
No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
1. 
Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas.
2. 
Any waters or wastes containing toxic or poisonous solids, liquids, or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any sewage treatment process, constitute a hazard in the receiving waters of the sewage treatment plant, including but not limited to cyanides in excess of two (2) mg/l as CN in the wastes as discharged to the public sewer.
3. 
Any waters or wastes having a ph lower than 5.5, or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works.
4. 
Solid or viscous substances in quantities or of such size capable of causing obstruction to flow in sewers, or other interference with the proper operation of the sewage works such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, mild containers, etc., either whole or ground by garbage grinders.
[Ord. No. 855 Art. V §4, 9-24-1996]
A. 
No person shall discharge or cause to be discharged the following described substances, materials, waters, or wastes if it appears likely in the opinion of the Superintendent that such wastes can harm either the sewers, sewage treatment process, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property or constitute a nuisance. In forming an opinion as to the acceptability of these wastes, the Superintendent will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewage treatment plant, degree of treatability or wastes in the sewage treatment plant, and other pertinent factors. The substances prohibited are:
1. 
Any liquid or vapor having a temperature higher than one hundred fifty degrees (150°) F (65° C).
2. 
Any water or wastes containing fats, wax, grease or oils, whether emulsified or not, in excess of one hundred (100) mg/l or containing substances which may solidify or become viscous at temperatures between thirty-two degrees (32°) and one hundred fifty degrees (150°) F (0 and 65° C).
3. 
Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths (¾) horsepower (0.76 hp metric) or greater shall be subject to the review and approval of the Superintendent.
4. 
Any waters or wastes containing strong acid, iron, pickling wastes or concentrated plating solutions, whether neutralized or not.
5. 
Any waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the Superintendent for such materials.
6. 
Any waters or wastes containing phenols or other taste or odor-producing substances, in such concentrations exceeding limits which may be established by the Superintendent as necessary, after treatment of the composite sewage, to meet the requirements of State, Federal, or other public agencies of jurisdiction for such discharge to the receiving waters.
7. 
Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable State or Federal regulations.
8. 
Any waters or wastes having a pH in excess of 9.5.
9. 
Materials which exert or cause:
a. 
Unusual concentrations of inert suspended solids (such as, but not limited to, Fullers earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride or sodium sulfate).
b. 
Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).
c. 
Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works.
d. 
Unusual volumes of flow or concentration of wastes constituting "slugs" as defined herein.
10. 
Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of the other agencies having jurisdiction over discharge to the receiving waters.
11. 
Any waters or wastes having
a. 
A five (5) day BOD greater than three hundred (300) parts per million by weight, or
b. 
Containing more than three hundred fifty (350) parts per million by weight of suspended solids, or
c. 
Having an average daily flow greater than two percent (2%) of the average sewage flow of the City, shall be subject to the review of the Superintendent.
Where necessary in the opinion of the Superintendent, the owner shall provide, at his/her expense, such preliminary treatment as may be necessary to
a.
Reduce the biochemical oxygen demand to three hundred (300) parts per million by weight, or
b.
Reduce the suspended solids to three hundred fifty (350) parts per million by weight, or
c.
Control the quantities and rates of discharge of such waters or wastes.
Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the Superintendent and no construction of such facilities shall be commenced until said approvals are obtained in writing.
[Ord. No. 855 Art. V §5, 9-24-1996]
A. 
If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which waters containing the substances or possess the characteristics enumerated in Section 705.160 of this Article, and which in the judgment of the Superintendent, may have a deleterious effect upon the sewage works, processes, equipment, or receiving waters, or which otherwise create a hazard to life to constitute a public nuisance, the Superintendent may:
1. 
Reject the wastes;
2. 
Require pretreatment to an acceptable condition for discharge to the public sewers;
3. 
Require control over the quantities and rates of discharge; and/or
4. 
Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of Section 705.220 of this Article.
B. 
If the Superintendent permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the Superintendent, and subject to the requirements of all applicable codes, ordinances and laws.
[Ord. No. 855 Art. V §6, 9-24-1996]
Grease, oil, and sand interceptors shall be provided when, in the opinion of the Superintendent, they are necessary for the proper handling of liquid wastes, sand, or other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the Superintendent and shall be located as to be readily and easily accessible for cleaning and inspection.
[Ord. No. 855 Art. V §7, 9-24-1996]
Where preliminary treatment or flow-equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his/her expense.
[Ord. No. 855 Art. V §8, 9-24-1996]
When required by the Superintendent, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of the wastes. Such manhole, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the Superintendent. The manhole shall be installed by the owner at his/her expense, and shall be maintained by him/her so as to be safe and accessible at all times.
[Ord. No. 855 Art. V §9, 9-24-1996]
All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this Article shall be determined in accordance with the latest edition of "Standard Methods for the Examination of Water and Wastewater", published by the American Public Health Association, and shall be determined at the control manhole provided, or upon suitable samples taken at said control manhole. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected. Sampling shall be carried out by customarily accepted methods to reflect the effect of constituents upon the sewage works and to determine the existence of hazards to life, limb, and property. (The particular analysis involved will determine whether a twenty-four (24) hour composite of all outfalls or a premise is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analyses are obtained from twenty-four (24) hour composites of all outfalls whereas pH analyses are determined from periodic grab samples.)
[Ord. No. 855 Art. V §10, 9-24-1996]
No statement contained in this Article shall be construed as preventing any special agreement or arrangement between the City and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment, subject to payment therefore, by the industrial concern.
[Ord. No. 855 Art. VI §1, 9-24-1996]
No person shall maliciously, willfully, or negligently break, damage, destroy, uncover, deface, or tamper with any structure, appurtenance, or equipment which is part of the sewage works. Any person violating this provision shall be subject to immediate arrest under charge of disorderly conduct.
[Ord. No. 855 Art. VII §§1 — 3, 9-24-1996]
A. 
The Superintendent and other duly authorized employees of the City bearing proper credentials and identification shall be permitted to enter all properties for the purposes of inspection, observation, measurement, sampling, and testing in accordance with the provisions of this Article. The Superintendent or his/her representatives shall have no authority to inquire into any processes including metallurgical, chemical, oil, refining, ceramic, paper, or other industries beyond that point having a direct bearing on the kind and source of discharge to the sewers or waterways or facilities for waste treatment.
B. 
While performing the necessary work on private properties referred to in Subsection (A) above, the Superintendent or duly authorized employees of the City shall observe all safety rules applicable to the premises established by the company and the company shall be held harmless for injury or death to the City employees and the City shall indemnify the company against loss or damage to its property by City employees and against liability claims and demands for personal injury or property damage asserted against the company and growing out of the gauging and sampling operation, except as such may be caused by negligence or failure of the company to maintain safe conditions as required in Section 705.200.
C. 
The Superintendent and other duly authorized employees of the City bearing proper credentials and identification shall be permitted to enter all private properties through which the City holds a duly negotiated easement for the purposes of, but not limited to, inspection, observation, measurement, sampling, repair, and maintenance of any portion of the sewage works lying within said easement. All entry and subsequent work, if any, on said easement, shall be done in full accordance with the terms of the duly negotiated easement pertaining to the private property involved.
[Ord. No. 855 Art. VIII §§1 — 3, 9-24-1996]
A. 
Any person found to be violating any provision of this Article except Section 705.230 shall be served by the City with written notice stating the nature of the violation and providing a reasonable time limit for the satisfactory correction thereof. The offender shall, within the period of time stated in such notice, permanently cease all violations.
B. 
Any person who shall continue any violation beyond the time limit provided for in Subsection (A) above, shall be guilty of a misdemeanor and on conviction thereof shall be fined in the amount not exceeding one hundred dollars ($100.00) for each violation. Each twenty-four (24) hour period in which any such violation shall continue shall be deemed a separate offense.
C. 
Any person violating any of the provisions of this Article shall become liable to the City for any expense, loss, or damage occasioned the City by reason of such violation.
[Ord. No. 857 Art. I, 10-8-1996]
It is determined and declared to be necessary and conducive to the protection of the public health, safety, welfare, and convenience of the City to collect charges from all users who contribute wastewater to the City's treatment works. The proceeds of such charges so derived will be used for the purpose of operating, maintaining, and retiring the debt for such public wastewater treatment works.
[Ord. No. 857 Art. II §§1 — 11, 10-8-1996]
Unless the context specifically indicates otherwise, the meaning of terms used in this Article shall be as follows:
BOD (denoting BIOCHEMICAL OXYGEN DEMAND)
The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five (5) days at twenty degrees centigrade (20°C), expressed in milligrams per liter (mg/l).
NORMAL DOMESTIC WASTEWATER
Wastewater that has a BOD concentration of not more than 250 mg/l and a suspended solids concentration of not more than 300 mg/l.
OPERATION AND MAINTENANCE
All expenditures during the useful life of the treatment works for materials, labor, utilities, and other items which are necessary for managing and maintaining the sewage works to achieve the capacity and performance for which such works were designed and constructed.
REPLACEMENT
Expenditures for obtaining and installing equipment, accessories, or appurtenances which are necessary during the useful life of the treatment works to maintain the capacity and performance for which such works were designed and constructed. The term "operation and maintenance" includes replacement.
RESIDENTIAL CONTRIBUTOR
Any contributor to the City's treatment works whose lot, parcel of real estate, or building is used for domestic dwelling purposes only.
SHALL
Is mandatory; MAY — is permissive.
SS (denoting SUSPENDED SOLIDS)
The solids that either float on the surface of or are in suspension in water, sewage, or other liquids and which are removable by laboratory filtering.
TREATMENT WORKS
Any devices and systems for the storage, treatment, recycling, and reclamation of municipal sewage, domestic sewage, or liquid industrial wastes. These include interceptor sewers, outfall sewers, sewage collection systems, individual systems, pumping, power, and other equipment and their appurtenances; extensions, improvements, remodeling, additions, and alterations thereof; elements essential to provide a reliable recycled supply such as standby treatment units and clear well facilities; and any works, including site acquisition of land that will be an integral part of the treatment process or is used for ultimate disposal of residues resulting from such treatment; or any other method or system for preventing, abating, reducing, storing, treating, separating, or disposing or municipal waste or industrial waste, including waste in combined storm water and sanitary sewer systems.
USEFUL LIFE
The estimated period during which the treatment works will be operated.
USER CHARGE
That portion of the total wastewater service charge which is levied in a proportional and adequate manner for the cost of operation, maintenance, and replacement of the wastewater treatment works.
WATER METER
A water volume measuring and recording device, furnished and/or installed by the City of Rock Port or furnished and/or installed by a user and approved by the City of Rock Port.
[1]
Editor's Note — Ord. no. 1113 §1, adopted December 19, 2012, repealed section 705.280 "revenues" in its entirety. Former section 705.280 derived from ord. no. 857 Art. III §§1 — 3, 10-8-1996. This section has been reserved for the city's future use.
[Ord. No. 857 Art. IV §§1 — 6, 10-8-1996; Ord. No. 1114 §§1 — 2, 12-19-2012]
A. 
Each user shall pay for the services provided by the City based on their use of the treatment works as determined by water meter(s) acceptable to the City.
B. 
For residential and commercial contributors, user charges shall be based on water used during the current month. If a commercial or residential contributor has a consumptive use of water, or in some other manner uses water which is not returned to the wastewater collection system, the user charge for that contributor may be based on separate water meter(s) installed and maintained at the contributor's expense, and in a manner acceptable to the City.
C. 
Any user which discharges any toxic pollutants which cause an increase in the cost of managing the effluent or the sludge from the City's treatment works, or any user which discharges any substance which singly or by interaction with other substances causes identifiable increases in the cost of operation, maintenance, or replacement of the treatment works, shall pay for such increased costs. The charge to each such user shall be as determined by the responsible plant operating personnel and approved by the Board of Aldermen.
[1]
Editor's Note — Ord. no. 1115 §1, adopted December 19, 2012, repealed section 705.300 "billing" in its entirety. Former section 705.300 derived from ord. no. 857 Art. V §§1 — 2, 10-8-1996. This section has been reserved for the city's future use.
[Ord. No. 857 Art. VI §§1 — 2, 10-8-1996]
A. 
The City shall review the user charge system annually and revise user charge rates as necessary to ensure that the system generates adequate revenues to pay the costs of operation and maintenance including replacement and that the system continues to provide for the proportional distribution of operation and maintenance including replacement costs among users and user classes.
B. 
The City will notify each user at least annually, in conjunction with a regular bill, of the rate being charged for operation, and maintenance including replacement of the treatment works.