Part II–Designated Uses and Criteria

pH

173-201A-200
Fresh water designated uses and criteria
.

Statutory Authority: Chapters 90.48 and 90.54 RCW. 03-14-129 (Order 02-14), § 173-201A-200, filed 7/1/03, effective 8/1/03.

 

(g) Aquatic life pH criteria. Measurement of pH is expressed as the negative logarithm of the hydrogen ion concentration. Table 200 (1)(g) lists the pH levels for each of the aquatic life use categories.

 

Table 200 (1)(g) Aquatic Life pH Criteria in Fresh Water

Use Category

pH Units
Char Spawning and Rearing pH shall be within the range of 6.5 to 8.5, with a human-caused variation within the above range of less than 0.2 units.
Core Summer Salmonid Habitat Same as above.
Salmonid Spawning, Rearing, and Migration pH shall be within the range of 6.5 to 8.5 with a human-caused variation within the above range of less than 0.5 units.
Salmonid Rearing and Migration Only Same as above.
Non-anadromous Interior Redband Trout Same as above.
Indigenous Warm Water Species Same as above.

 

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Last updated October 2007