SWRP: Tualatin Water Quality Standards

TUALATIN STANDARDS

Tualatin Water Quality Standards/Criteria/TMDL Targets

Parameter	Reach	Standard/Criteria
Temperature		Salmonid fish rearing: No measurable increases when stream temps are greater than 64° F (17.8° C)
Temperature		Salmonid spawning (waters and periods): No measurable increases when stream temps are greater than 55° F (12.8° C)
Dissolved Oxygen	All Waters: cool water habitat	Grab samples: > 6.5 mg/L O2
Dissolved Oxygen	All Waters: cool water habitat	Continuous monitoring: 30-day average of daily means > 6.5 mg/L, 7-day average of daily minimums > 5.0 mg/L, at all times > 4.0 mg/L
pH	All Waters	6.5 < pH < 8.5
Ammonia (May 1 - November 15)	Dilley (R.M. 58.5, upstream) & Scoggins Creek	< 0.03 mg/L NH3-N
	Golf Course Rd (R.M. 52.8, upstream) & Gales, Dairy and McKay Creeks	< 0.04 mg/L NH3-N
	Rood Bridge Rd (R.M. 39.1, upstream)	< 0.05 mg/L NH3-N
	Rock, Fanno and Chicken Creeks	< 0.10 mg/L NH3-N
	Farmington (R.M. 33.3, upstream)	< 1.0 mg/L NH3-N
	Mainstem (R.M. 0.0 to 38.5) & Rock, Fanno and Chicken Creeks	< 0.85 mg/L NH3-N
Nitrate	All Waters	< 10 mg/L NO3-N (drinking water criteria)
Total Phosphorus (May 1 - October 31)	Cherry Grove (upstream)	< 0.02 mg/L T-PO4 as P
	Dilley (R.M. 58.5 to 67.8)	< 0.04 mg/L T-PO4 as P
	Golf Course Rd (R.M. 52.8 to RM 58.8) & Gales, Dairy and McKay Creeks	< 0.045 mg/L T-PO4 as P
	Rood Bridge Rd (RM 39.1 to RM 52.8)	< 0.05 mg/L T-PO4 as P
	Scoggins Creek	< 0.06 mg/L T-PO4 as P
	Mainstem (R.M. 0.0 to 38.5) & Rock, Fanno and Chicken Creeks	< 0.07 mg/L T-PO4 as P
E. coli	All Waters	No one time sample shall exceed 406 CFU/100 mL

The Student Watershed Research Project is a
self funded program of Portland State University's
Environmental Sciences and Resources

Last updated February 18, 2003

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