Kalamazoo City
English Spanish

Limits & Permits

Discharges to the Kalamazoo Water Reclamation Plant

Discharges from users to the KWRP are listed below (condensed from the General Pretreatment Regulations and the Kalamazoo City Code of Ordinances).


Pollutant Daily Maximum Concentration
cadmium 0.040 mg/L
chromium 4.670 mg/L
copper 2.230 mg/L
lead 0.110 mg/L
nickel 1.590 mg/L
zinc 5.300 mg/L
cyanide 0.250 mg/L
total petroleum hydrocarbon 100.0 mg/L
pH 6.2-9.8 S.U.
BETX 15.0 mg/L

Prohibited Discharges

PCB's - no discharge allowed. (0.0001 mg/L required detection limit)

Mercury - no discharge allowed. (0.0002 mg/L required detection limit)

Pollutants which cause a fire or explosion hazard including, but not limited to waste streams with a closed cup flash point of less than 140° Fahrenheit or 60° Centigrade.

Solid or viscous pollutants in amounts that will cause obstruction in flow, or interference with the operation of the wastewater system.

Any pollutant, including oxygen demanding pollutants (BOD, etc.), that will cause interference with wastewater treatment or which will pass through untreated.

Heat in amounts that will inhibit biological activity, but in no case heat in such quantities that the temperature at the plant exceeds 40°C (104°F).

Pollutants that result in the presence of toxic gases, vapors or fumes in a quantity that may cause worker health and safety problems for sewer workers or the general public.

Any trucked or hauled pollutants except at a designated discharge point at the Kalamazoo Water Reclamation Plant.

Radioactive wastes or isotopes, unless their disposal via wastewater is authorized by federal, state and local regulations; and then only when discharged into the wastewater system does not cause damage or a hazard to the system, persons operating the system, or the general public.

Wasteater discharged at a rate that upsets or interferes with the treatment process or causes a hydraulic surge.

Storm water, uncontaminated groundwater, and unpolluted non-contact cooling water.

In addition to these limitations, certain industrial discharges are subject to Categorical Pretreatment Standards.

Discharges to the Kalamazoo River from the KWRP - National Pollutant Discharge Elimination System (NPDES) Permit

The City of Kalamazoo Wastewater Treatment Plant currently discharges to the Kalamazoo River under a National Pollutant Discharge Elimination System permit MI0023299. The Michigan Department of Natural Resources, Department of Environmental Quality issued the NPDES permit to the Kalamazoo WWTP.

This detailed permit includes the following information that may interest many citizens of Kalamazoo

Effluent Limitation

   Time    Concentration  Frequency 
CBOD5  5/1-9/30  10 mg/L  daily maximum
4 mg/L monthly average
   10/1-10/31  15 mg/L  daily maximum
11/1-11/30  27 mg/L  daily maximum
   12/1-4/30  25 mg/L  monthly average
40 mg/L 7 day average
Total  5/1-9/30  20 mg/L  monthly average
Suspended  30 mg/L 7 day average
Solids 10/1-4/30 30 mg/L monthly average
45 mg/L 7 day average
Ammonia 5/1-9/30  2 mg/L  daily maximum
(N) 0.5 mg/L monthly average
10/1-10/31  6.5 mg/L  daily maximum
Phosphorus  year-round  1.0 mg/L or 225 lbs monthly average
(P) (whichever is less)
Fecal  year-round  200 counts/100mL  monthly average
Coliform 400 counts/100mL  7 day average
Chlorine  year-round  0.038 mg/L  daily maximum
pH  year-round  6.0 S.U. daily minimum
9.0 S.U. daily maximum
Dissolved  year-round  4.0 mg/L daily minimum
Total  year-round 3.0 ng/L  12 month rolling
Mercury and average
0.0013 lbs/day quarterly test
Chronic  year-round 2.0 TUc  monthly average
Toxicity quarterly test
Acute  year-round  1.0 TUa  quarterly test
Selenium 4.5 lbs daily maximum
and average
10 ug/L quarterly test


The permittee shall have the legal authority and necessary interjurisdictional agreements that provide the basis for implementation and enforcement of the approved Federal Industrial Pretreatment Program throughout the service area.

The permittee shall maintain a list of its non-domestic users that meet the criteria of a "significant industrial user."

The permittee shall give proof of publication of all non-domestic users in significant noncompliance in the largest daily newspaper in the permittee's area.

For more information regarding discharge restrictions, limits or regulations, contact Steve Rochow at (269) 337-8365.

Storm Water Pollution Prevention Plan

Although the KWRP has separate sanitary sewer and storm water systems, it must still monitor inflow to the Kalamazoo River that comes from the storm sewer. Therefore, the KWRP has developed a Storm Water Pollution Prevention Plan. This plan ensures that no substance enters the river through the KWRP storm sewer that could violate Michigan's Water Quality Standards.