Water Quality Standards for Surface Waters of Washington WAC 173-201A
June, 1998


PARAMETERCLASS AACLASS ACLASS B
Temperature
(Centegrade)
<16 <18 <21
Dissolved Oxygen
(mg/L)
>9.5 >8.0 >6.5
pH 6.5-8.56 6.5-8.5 6.5-8.5
Fecal Coliform
(#100mL)
<50 <100 <200
Dissolved Gas Saturation <110% <110% <110%
Turbidity <5 NTU <5 NTU <10 NTU
* Phosphorus .1 ug/L .1 ug/L .1 ug/L
* Nitrates/Nitrites <10 mg/L <10 mg/L <10 mg/L

* USEPA Water Quality Criteria for Water, 1986

Water Body Characteristics

Class AA: Water quality of this class shall exceed requirements for all uses. Uses include water supply (domestic, industrial, agricultural) stock watering, fish and shellfish, wildlife habitat, primary contact recreation, sport fishing, boating, and aesthetic enjoyment, commerce and navigation.

Class A: Water quality of this class shall exceed requirements for all uses. Uses include water supply (domestic, industrial, agricultural), stock watering fish and shellfish, wildlife habitat, primary contact recreation, sport fishing, boating, and aesthetic enjoyment, commerce and navigation.

Class B: Water quality of this class shall exceed requirements for all uses. Uses include water supply (industrial, agricultural), stock watering, fish and shellfish, wildlife habitat, secondary contact recreation, sport fishing, boating, and aesthetic enjoyment, commerce and navigation.