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Regents, University of California

Sewage treatment plant, major discharger, Davis, California. NPDES permit CA0077895, in force until Sep 30, 2031. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 2 of 33 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025Nitrite + Nitrate total [as N], monthly average12 mg/L≤ 10 mg/L20%
June 2026%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, monthly median40.9 % effect≤ 25 % effect64%

Limits in force (35)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all yearEFF1
Specific conductancedaily maximumreport only (umho/cm)all yearEFF1
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all yearEFF1
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall yearEFF1
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall yearEFF1
pHinstantaneous minimum≥ 6.5 SUall yearEFF1
pHinstantaneous maximum≤ 8.5 SUall yearEFF1
Solids, total suspendedmonthly average≤ 10 mg/Lall yearEFF1
Solids, total suspendedweekly average≤ 15 mg/Lall yearEFF1
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJan, Feb, Mar, Apr, Nov, DecEFF1
Nitrogen, ammonia total [as N]monthly average≤ .61 mg/LMay–OctEFF1
Nitrogen, ammonia total [as N]weekly average≤ 3.2 mg/LJan, Feb, Mar, Apr, Nov, DecEFF1
Nitrogen, ammonia total [as N]weekly average≤ 1.9 mg/LMay–OctEFF1
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all yearEFF1
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall yearEFF1
Nitrite + Nitrate total [as N]weekly average≤ 14 mg/Lall yearEFF1
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearEFF1
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all yearEFF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearEFF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearEFF1
Coliform, total generalinstantaneous maximum≤ 240 MPN/100mLall yearEFF1
Coliform, total general7-day median≤ 2.2 MPN/100mLall yearEFF1
Coliform, total general30-day maximum≤ 23 MPN/100mLall yearEFF1
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all yearEFF1
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearEFF1
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximum≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatamonthly median≤ 0 pass=0;fail=1all yearEFF1
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatadaily maximum≤ 50 % effectall yearEFF1
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF1
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF1
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1

New limits from Jan 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Mercury, total recoverable, annual total0.015 lb/yrnew——

How strict are these limits?

Cited limits by parameter: California'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/CA0077895 · MCP: https://passage-data.com/mcp