Passage Data · Check a report · Use it from your AI

Dona Ana County (South Central Regional WWTP)

Sewage treatment plant, major discharger, La Mesa, New Mexico. NPDES permit NM0030490, in force until May 31, 2030. Last 12 months: over a limit 3 times (last July 2026), 16 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (35 values), outfall TX1 form A monthly (16 values), outfall 001 form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 51 required values missing, 9 of 18 reports late

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

Period endingParameterReportedLimitOver by
December 2025Boron, dissolved [as B], daily maximum1700 ug/L≤ 750 ug/L127%
February 2026E. coli, daily maximum1300 CFU/100mL≤ 410 CFU/100mL217%
July 2026E. coli, daily maximum727 CFU/100mL≤ 410 CFU/100mL77%

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. C30-day average≤ 263 lb/dall year001
BOD, 5-day, 20 deg. C7-day average≤ 394 lb/dall year001
BOD, 5-day, 20 deg. C30-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≤ 263 lb/dall year001
Solids, total suspended7-day average≤ 394 lb/dall year001
Solids, total suspended30-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
Boron, dissolved [as B]30-day average≤ 750 ug/Lall year001
Boron, dissolved [as B]daily maximum≤ 750 ug/Lall year001
Boron, dissolved [as B]30-day average≤ 6.567 lb/dall year001
Boron, dissolved [as B]7-day average≤ 6.567 lb/dall year001
Uranium, total30-day averagereport only (pg/L)all year001
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year001
Flow, in conduit or thru treatment plant7-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
E. coli30-day geometric mean≤ 5.01 BCFU/dall year001
Alpha, gross adjusted30-day averagereport only (pCi/L)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
Whole Effluent Toxicity [WET] - C. dubiaminimum value≥ 100 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelasminimum value≥ 100 %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 Jun 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Cyanide, total [as CN], daily maximum5.2 ug/Lnew5.4 ug/L (12 values)1.04×
Cyanide, total [as CN], 30-day average0.046 lb/dnew0.0096 lb/d (12 values)0.209×
Cyanide, total [as CN], 30-day average5.2 ug/Lnew2.825 ug/L (12 values)0.543×
Cyanide, total [as CN], 7-day average0.046 lb/dnew0.01785 lb/d (12 values)0.388×

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NM0030490 · MCP: https://passage-data.com/mcp