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Carlsbad, City of

Sewage treatment plant, major discharger, Carlsbad, New Mexico. NPDES permit NM0026395, in force until Aug 31, 2030. Last 12 months: over a limit 33 times (last September 2026), 11 required values missing, 9 of 32 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (33 values), outfall TX1 form A monthly (11 values), outfall TX1 form Q quarterly (10 values), outfall 001 form AS twice a year, outfall 001 form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 1 of 17 reports late

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

All 33 values over a limit
Period endingOutfallParameterReportedLimitOver by
October 2025001BOD, 5-day, 20 deg. C, 30-day average23.97 mg/L≤ 7 mg/L242%
October 2025001BOD, 5-day, 20 deg. C, 30-day average542.7 lb/d≤ 292.1 lb/d86%
October 2025001BOD, 5-day, 20 deg. C, 7-day average1824.7 lb/d≤ 709.3 lb/d157%
October 2025001BOD, 5-day, 20 deg. C, 7-day average77.04 mg/L≤ 17 mg/L353%
October 2025001E. coli, daily maximum2420 CFU/100mL≤ 410 CFU/100mL490%
October 2025001Solids, total suspended, 7-day average62.33 mg/L≤ 45 mg/L39%
November 2025001BOD, 5-day, 20 deg. C, 30-day average9.97 mg/L≤ 7 mg/L42%
May 2026001E. coli, daily maximum687 CFU/100mL≤ 410 CFU/100mL68%
June 2026001BOD, 5-day, 20 deg. C, 30-day average14.7 mg/L≤ 7 mg/L110%
June 2026001BOD, 5-day, 20 deg. C, 7-day average23.17 mg/L≤ 17 mg/L36%
June 2026001E. coli, 30-day geometric mean442.27 CFU/100mL≤ 126 CFU/100mL251%
June 2026001E. coli, daily maximum2420 CFU/100mL≤ 410 CFU/100mL490%
July 2026001BOD, 5-day, 20 deg. C, 30-day average39.88 mg/L≤ 7 mg/L470%
July 2026001BOD, 5-day, 20 deg. C, 30-day average909.4 lb/d≤ 292.1 lb/d211%
July 2026001BOD, 5-day, 20 deg. C, 7-day average2353.64 lb/d≤ 709.3 lb/d232%
July 2026001BOD, 5-day, 20 deg. C, 7-day average99.32 mg/L≤ 17 mg/L484%
July 2026001E. coli, 30-day geometric mean1734.56 CFU/100mL≤ 126 CFU/100mL1277%
July 2026001E. coli, daily maximum2420 CFU/100mL≤ 410 CFU/100mL490%
August 2026001BOD, 5-day, 20 deg. C, 30-day average39.88 mg/L≤ 7 mg/L470%
August 2026001BOD, 5-day, 20 deg. C, 30-day average909.4 lb/d≤ 292.1 lb/d211%
August 2026001BOD, 5-day, 20 deg. C, 7-day average2353.64 lb/d≤ 709.3 lb/d232%
August 2026001BOD, 5-day, 20 deg. C, 7-day average99.32 mg/L≤ 17 mg/L484%
August 2026001E. coli, 30-day geometric mean1734.56 CFU/100mL≤ 126 CFU/100mL1277%
August 2026001E. coli, daily maximum2420 CFU/100mL≤ 410 CFU/100mL490%
September 2026001BOD, 5-day, 20 deg. C, 30-day average28.16 mg/L≤ 7 mg/L302%
September 2026001BOD, 5-day, 20 deg. C, 30-day average597.37 lb/d≤ 292.1 lb/d105%
September 2026001BOD, 5-day, 20 deg. C, 7-day average37.68 mg/L≤ 17 mg/L122%
September 2026001BOD, 5-day, 20 deg. C, 7-day average801.03 lb/d≤ 709.3 lb/d13%
September 2026001E. coli, 30-day geometric mean2420 CFU/100mL≤ 126 CFU/100mL1821%
September 2026001E. coli, daily maximum2420 CFU/100mL≤ 410 CFU/100mL490%
September 2026001Solids, total suspended, 30-day average35.49 mg/L≤ 30 mg/L18%
September 2026001Solids, total suspended, 7-day average62 mg/L≤ 45 mg/L38%
September 2026TX1Whole Effluent Toxicity [WET] - C. dubia, minimum value65 %≥ 87 %25%

Limits in force (61)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. C30-day average≤ 7 mg/Lall year001
BOD, 5-day, 20 deg. C7-day average≤ 17 mg/Lall year001
BOD, 5-day, 20 deg. C30-day average≤ 292.1 lb/dall year001
BOD, 5-day, 20 deg. C7-day average≤ 709.3 lb/dall year001
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. C7-day averagereport only (mg/L)all year001
pHminimum≥ 6.6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Solids, total suspended30-day average≤ 1252 lb/dall year001
Solids, total suspended7-day average≤ 1878 lb/dall year001
Solids, total suspended30-day averagereport only (mg/L)all year001
Solids, total suspended7-day averagereport only (mg/L)all year001
Nitrogen, total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]30-day averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Cyanide, total [as CN]30-day averagereport only (ug/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Cyanide, total [as CN]30-day averagereport only (lb/d)all year001
Cyanide, total [as CN]7-day averagereport only (lb/d)all year001
Uranium, total30-day averagereport only (pg/L)all year001
4,4'-DDT30-day averagereport only (mg/L)all year001
4,4'-DDTdaily maximumreport only (mg/L)all year001
Polychlorinated biphenyls [PCBs]30-day averagereport only (mg/L)all year001
Polychlorinated biphenyls [PCBs]daily maximumreport only (mg/L)all year001
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualinstantaneous maximum≤ 11 ug/Lall year001
E. coli30-day geometric mean≤ 126 CFU/100mLall year001
E. colidaily maximum≤ 410 CFU/100mLall year001
Alpha, gross adjusted30-day averagereport only (pCi/L)all year001
PER-AND POLYFLUOROALKYL SUBSTANCESdaily maximumreport only (ng/L)all year001
PER-AND POLYFLUOROALKYL SUBSTANCESdaily maximumreport only (ng/L)all year001
PER-AND POLYFLUOROALKYL SUBSTANCESdaily maximumreport only (ng/g)all year001
Alpha gross radioactivity30-day averagereport only (pCi/L)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
PFAS Sumdaily maximumreport only (ng/L)all year001
Whole effluent toxicity - retest #1valuereport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1valuereport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2valuereport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2valuereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity - Retest #3valuereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity - Retest #3valuereport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity [WET] - C. dubiaminimum value≥ 87 %all yearTX1
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiavaluereport only (pass=0;fail=1)all yearTX1
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasvaluereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiavaluereport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasvaluereport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiavaluereport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasvaluereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiavaluereport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasvaluereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiavaluereport only (%)all yearTX1
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasvaluereport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiavaluereport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasvaluereport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiavaluereport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasvaluereport only (%)all yearTX1

New limits from Sep 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Cyanide, total [as CN], 30-day average0.22 lb/dnew——
Cyanide, total [as CN], 30-day average5.2 ug/Lnew——
Cyanide, total [as CN], 7-day average0.25 lb/dnew——
Cyanide, total [as CN], daily maximum5.99 ug/Lnew——

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NM0026395 · MCP: https://passage-data.com/mcp