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

San Marcos, City of

Sewage treatment plant, major discharger, San Marcos, Texas. NPDES permit TX0047945, in force until Jan 21, 2030. Last 12 months: over a limit 21 times (last August 2026), 6 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (24 values), outfall TX1 form Q quarterly (24 values), outfall TXA form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
36 values over a limit, 0 required values missing, 1 of 16 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, daily maximum2076 CFU/100mL≤ 399 CFU/100mL420%
October 2025Nitrogen, ammonia total [as N], daily average2.86 mg/L≤ 2 mg/L43%
October 2025Nitrogen, ammonia total [as N], daily maximum10.7 mg/L≤ 10 mg/L7%
November 2025E. coli, daily average227.48 CFU/100mL≤ 126 CFU/100mL81%
November 2025E. coli, daily maximum921 CFU/100mL≤ 399 CFU/100mL131%
December 2025E. coli, daily average135.67 CFU/100mL≤ 126 CFU/100mL8%
December 2025E. coli, daily maximum640 CFU/100mL≤ 399 CFU/100mL60%
January 2026E. coli, daily average134.23 CFU/100mL≤ 126 CFU/100mL7%
February 2026E. coli, daily average176.09 CFU/100mL≤ 126 CFU/100mL40%
February 2026E. coli, daily maximum411 CFU/100mL≤ 399 CFU/100mL3%
February 2026Nitrogen, ammonia total [as N], daily average2.58 mg/L≤ 2 mg/L29%
April 2026E. coli, daily average193.07 CFU/100mL≤ 126 CFU/100mL53%
April 2026E. coli, daily maximum2203 CFU/100mL≤ 399 CFU/100mL452%
May 2026E. coli, daily average230 CFU/100mL≤ 126 CFU/100mL83%
May 2026E. coli, daily maximum2420 CFU/100mL≤ 399 CFU/100mL507%
June 2026E. coli, daily average195.02 CFU/100mL≤ 126 CFU/100mL55%
June 2026E. coli, daily maximum602 CFU/100mL≤ 399 CFU/100mL51%
July 2026E. coli, daily average209.88 CFU/100mL≤ 126 CFU/100mL67%
July 2026E. coli, daily maximum435 CFU/100mL≤ 399 CFU/100mL9%
August 2026E. coli, daily average182.83 CFU/100mL≤ 126 CFU/100mL45%
August 2026E. coli, daily maximum517 CFU/100mL≤ 399 CFU/100mL30%

Limits in force (50)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 5 mg/Lall year001
Solids, total suspendeddaily maximum≤ 20 mg/Lall year001
Solids, total suspendeddaily average≤ 375 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 2 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]daily average≤ 150 lb/dall year001
Phosphorus, total [as P]daily average≤ 1 mg/Lall year001
Phosphorus, total [as P]daily maximum≤ 4 mg/Lall year001
Phosphorus, total [as P]daily average≤ 75 lb/dall year001
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plant2-hour peak≤ 21528 gal/minall year001
Flow, in conduit or thru treatment plantannual average≤ 9 MGDall year001
E. colidaily average≤ 126 CFU/100mLall year001
E. colidaily maximum≤ 399 CFU/100mLall year001
Solids, total dissolveddaily averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily averagereport only (lb/d)all year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 5 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 375 lb/dall year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXA

How strict are these limits?

Cited limits by parameter: Texas'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/TX0047945 · MCP: https://passage-data.com/mcp