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Mill Creek Ammonia-Nitrogen TMDL

Publication number Date Published
93-10-211February 1993
VIEW NOW Mill Creek Ammonia-Nitrogen TMDL (Number of pages: 7) (Publication Size: 853KB)

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Author(s) Steve Butkus
Description Prior to the city of Walla Walla's 1983 NPDES permit, Mill Creek water quality was impaired due to chlorine toxicity, low dissolved oxygen (DO), and ammonia. In March 1992 Ecology submitted a total maximum daily load (TMDL) to EPA for un-ionized ammonia-N. The TMDL determined a loading capacity for total ammonia-N to be consistent with the state water quality standards. No wasteload allocation (WLA) was set for ammonia-N during the permitted discharge period. A WLA of zero pounds of ammonia-N per day was set for the period from May through November.
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Keywords nitrogen, water quality improvement project, water cleanup plan, TMDL, Total Maximum Daily Load, ammonia
WEB PAGE Water Quality Improvement Projects - Mill Creek Area: Multi-parameter
WATERSHED Water Resource Inventory Area 32 Walla Walla

Walla Walla Wastewater Treatment Plant/Mill Creek Receiving Water Survey, February 12-13, 1986, and TMDL Evaluation.