A. 
The wastewater service charge for the use of and for service supplied by the wastewater facilities of the Village of Dwight shall consist of a basic user charge for operation and maintenance plus replacement, and a surcharge, if applicable.
B. 
The user charge shall be based on water usage as recorded by water meters for normal wastes having the following strengths:
(1) 
A five day, 20° C. biochemical oxygen demand (BOD) of 200 mg/l;
(2) 
A suspended solids (SS) content of 250 mg/l.
C. 
Water meter readings shall be assumed to equal sewage flow except in cases where the user may show that water passed through the meter is not returned to the sewer. An adjustment in meter readings will be made in such cases if the user furnishes the Village actual meter readings of water flow not discharged to the sewer.
D. 
The user charge shall consist of operation and maintenance costs plus replacement and shall be computed as follows:
(1) 
Estimate the projected annual revenue required to operate and maintain the wastewater facilities including a replacement fund for the year and, the debt service requirements;
(2) 
Estimate wastewater volume discharged at the sewer system based on total water meter readings after appropriate adjustment for water not returned at the sewer and/or water from unmetered private sources which is discharged to the sewer system;
(3) 
Compute costs per 1,000 gallons for normal sewage strength wastes.
E. 
A surcharge will be levied to all users whose waters exceed the normal concentrations for BOD (200 mg/l) and SS (250 mg/l). The surcharge will be based on water used as recorded by water meters and/or sewage meters for all wastes which exceed the 200 mg/l and 250 mg/l concentration for BOD and SS, respectively. Article III, § 215-38 specifies the procedure to compute a surcharge.
F. 
The adequacy of the wastewater service charge shall be reviewed annually by Certified Public Accountants for the Village in their annual audit report. The wastewater service charge shall be revised periodically to reflect a change in operation and maintenance costs including replacement costs and adjusted as required. One of the purposes of the annual review shall be to maintain service charges in relation to cost and assure that all user classes are being charged an equitable share.
The volume of flow used for computing user charges and surcharges shall be the metered water consumption read to the lowest even increments of 1,000 gallons.
A. 
If the person discharging wastes into the public sewers procures any part or all of his water from sources other than the Village of Dwight Water System, all or a part of which is discharged into the public sewers, the person shall install and maintain, at the owner's expense, water meters of a type approved by the Village for the purpose of determining the volume of water obtained from these other sources.
B. 
Devices for measuring the volume of waste discharged at the sanitary sewer may be required by the Plumbing Inspector if these volumes cannot otherwise be determined from the metered water consumption records.
C. 
Devices for measuring the volume of waste not discharged to the sanitary sewer may be required by the Plumbing Inspector if reasonable estimates cannot be made for adjusting water meter readings.
D. 
Metering devices for determining the volume of waste shall be installed, owned, and maintained by the person. Following approval and installation, such meters may not be removed, unless service is canceled, without the consent of the Village Board.
There shall be and there is hereby established a minimum charge and basic user rate for the use of and for service supplied by the Wastewater Facilities of the Village. The rates are established by the Village Board of Trustees and are as shown in the water and sewer rate schedule.
For waste strengths above normal strength of 200 mg/l BOD and 250 mg/l SS, a surcharge as designated in the water and sewer rate schedule shall be applied.