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Three Rivers Regional Wastewater Authority

Sewage treatment plant, major discharger, Longview, Washington. NPDES permit WA0037788 expired Feb 28, 2026; its limits still apply. Last 12 months: no values over a limit, 22 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (2 values), outfall 001 form QQ quarterly (4 values), outfall INF form MM monthly (14 values), outfall 001 form AA yearly
Last report on file
February 2026
Oct 2024 – Sep 2025
0 values over a limit, 24 required values missing, 0 of 29 reports late

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeaveragereport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C) (alert, not enforceable)all year001
Oxygen, dissolved [DO]averagereport only (mg/L) (alert, not enforceable)all year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedaverage≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedaverage≤ 4815 lb/dall year001
Solids, total suspendedweekly average≤ 7223 lb/dall year001
Oil and grease [soxhlet extr.] tot.averagereport only (mg/L) (alert, not enforceable)all year001
Nitrogen, ammonia total [as N]average≤ 15 mg/L (alert, not enforceable)May–Oct001
Nitrogen, ammonia total [as N]average≤ 22.8 mg/L (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)May–Oct001
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]averagereport only (lb/d) (alert, not enforceable)all year001
Nitrogen, ammonia total [as N]maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]maximumreport only (lb/d) (alert, not enforceable)all year001
Nitrogen, Kjeldahl, total [as N]averagereport only (mg/L) (alert, not enforceable)all year001
Nitrite + Nitrate total [as N]averagereport only (mg/L) (alert, not enforceable)all year001
Phosphorus, total [as P]averagereport only (mg/L) (alert, not enforceable)all year001
Phosphorus, dissolved reactive [drp as P]averagereport only (mg/L) (alert, not enforceable)all year001
Hardness, total [as CaCO3]averagereport only (mg/L) (alert, not enforceable)all year001
Chlorine, total residualaverage≤ .03 mg/Lall year001
Chlorine, total residualweekly average≤ .09 mg/Lall year001
Chlorine, total residualaverage≤ 7 lb/dall year001
Chlorine, total residualweekly average≤ 20 lb/dall year001
Net rate of additionof heatmonthly average≤ 3190 mkcal/dayJul–Sep001
Solids, total dissolvedaveragereport only (mg/L) (alert, not enforceable)all year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
Flowaveragereport only (MGD) (alert, not enforceable)all year001
Flowmaximumreport only (MGD) (alert, not enforceable)all year001
BOD, carbonaceous [5 day, 20 C]average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]average≤ 3900 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 5850 lb/dall year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year001
Solids, total suspendedaveragereport only (mg/L) (alert, not enforceable)all yearINF
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearINF
Solids, total suspendedaveragereport only (lb/d) (alert, not enforceable)all yearINF
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all yearINF
Nitrogen, ammonia total [as N]averagereport only (mg/L) (alert, not enforceable)all yearINF
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)all yearINF
Nitrogen, ammonia total [as N]averagereport only (lb/d) (alert, not enforceable)all yearINF
Nitrogen, ammonia total [as N]maximumreport only (lb/d) (alert, not enforceable)all yearINF
Flowaveragereport only (MGD) (alert, not enforceable)all yearINF
Flowmaximumreport only (MGD) (alert, not enforceable)all yearINF
BOD, carbonaceous [5 day, 20 C]averagereport only (mg/L) (alert, not enforceable)all yearINF
BOD, carbonaceous [5 day, 20 C]maximumreport only (mg/L) (alert, not enforceable)all yearINF
BOD, carbonaceous [5 day, 20 C]averagereport only (lb/d) (alert, not enforceable)all yearINF
BOD, carbonaceous [5 day, 20 C]maximumreport only (lb/d) (alert, not enforceable)all yearINF

How strict are these limits?

Cited limits by parameter: Washington's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0037788 · MCP: https://passage-data.com/mcp