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Mangrove Lagoon

Sewage treatment plant, St. Thomas, the U.S. Virgin Islands. NPDES permit VI0002003 expired Apr 30, 2020; its limits still apply. Last 12 months: over a limit 74 times (last August 2026), 175 required values missing, 33 of 35 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (21 values), outfall 002 form A monthly (2 values), outfall 003 form A monthly (16 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
107 values over a limit, 155 required values missing, 30 of 38 reports late

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

All 74 values over a limit
Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, monthly average51.7 mg/L≤ 30 mg/L72%
January 2026BOD, 5-day, 20 deg. C, weekly average51.7 mg/L≤ 45 mg/L15%
January 2026BOD, 5-day, percent removal, monthly average minimum76.6 %≥ 85 %56%
January 2026Chlorine, total residual, daily maximum1.45 mg/L≤ .013 mg/L11054%
January 2026Chlorine, total residual, weekly average.374 mg/L≤ .075 mg/L399%
January 2026Coliform, fecal general, monthly average20000 #/100mL≤ 70 #/100mL28471%
January 2026Enterococci, daily maximum6000 #/100mL≤ 104 #/100mL5669%
January 2026Enterococci, monthly average3000 #/100mL≤ 35 #/100mL8471%
January 2026Oxygen, dissolved [DO], minimum1.1 mg/L≥ 5.5 mg/L80%
January 2026Phosphorus, total [as P], daily maximum1.73 mg/L≤ .05 mg/L3360%
January 2026Solids, suspended percent removal, monthly average minimum-46.7 %≥ 85 %878%
January 2026Solids, total suspended, monthly average137.5 mg/L≤ 30 mg/L358%
January 2026Solids, total suspended, weekly average137.5 mg/L≤ 45 mg/L206%
January 2026Turbidity, daily maximum97.5 NTU≤ 3 NTU—
January 2026pH, minimum6.98 SU≥ 7 SU—
February 2026BOD, 5-day, 20 deg. C, monthly average48.2 mg/L≤ 30 mg/L61%
February 2026BOD, 5-day, 20 deg. C, weekly average48.2 mg/L≤ 45 mg/L7%
February 2026BOD, 5-day, percent removal, monthly average minimum80.5 %≥ 85 %30%
February 2026Coliform, fecal general, monthly average20000 #/100mL≤ 70 #/100mL28471%
February 2026Enterococci, daily maximum2540 #/100mL≤ 104 #/100mL2342%
February 2026Enterococci, monthly average1505 #/100mL≤ 35 #/100mL4200%
February 2026Oxygen, dissolved [DO], minimum1.28 mg/L≥ 5.5 mg/L77%
February 2026Phosphorus, total [as P], daily maximum1.34 mg/L≤ .05 mg/L2580%
February 2026Turbidity, daily maximum52.6 NTU≤ 3 NTU—
March 2026BOD, 5-day, percent removal, monthly average minimum83.8 %≥ 85 %8%
March 2026Coliform, fecal general, monthly average134500 #/100mL≤ 70 #/100mL—
March 2026Enterococci, daily maximum20000 #/100mL≤ 104 #/100mL19131%
March 2026Enterococci, monthly average14000 #/100mL≤ 35 #/100mL39900%
March 2026Oxygen, dissolved [DO], minimum1.68 mg/L≥ 5.5 mg/L69%
March 2026Phosphorus, total [as P], daily maximum1.63 mg/L≤ .05 mg/L3160%
March 2026Solids, suspended percent removal, monthly average minimum64.1 %≥ 85 %139%
March 2026Solids, total suspended, monthly average95.8 mg/L≤ 30 mg/L219%
March 2026Solids, total suspended, weekly average95.8 mg/L≤ 45 mg/L113%
March 2026Turbidity, daily maximum97.9 NTU≤ 3 NTU—
April 2026BOD, 5-day, 20 deg. C, monthly average46.3 mg/L≤ 30 mg/L54%
April 2026BOD, 5-day, 20 deg. C, weekly average46.3 mg/L≤ 45 mg/L3%
April 2026BOD, 5-day, percent removal, monthly average minimum58.8 %≥ 85 %175%
April 2026Coliform, fecal general, monthly average20000 #/100mL≤ 70 #/100mL28471%
April 2026Enterococci, daily maximum17200 #/100mL≤ 104 #/100mL16438%
April 2026Enterococci, monthly average15100 #/100mL≤ 35 #/100mL43043%
April 2026Oxygen, dissolved [DO], minimum1.11 mg/L≥ 5.5 mg/L80%
April 2026Phosphorus, total [as P], daily maximum2.15 mg/L≤ .05 mg/L4200%
April 2026Solids, suspended percent removal, monthly average minimum66 %≥ 85 %127%
April 2026Solids, total suspended, monthly average48 mg/L≤ 30 mg/L60%
April 2026Solids, total suspended, weekly average48 mg/L≤ 45 mg/L7%
April 2026Turbidity, daily maximum45 NTU≤ 3 NTU—
May 2026Coliform, fecal general, monthly average4000 #/100mL≤ 70 #/100mL5614%
May 2026Enterococci, daily maximum200 #/100mL≤ 104 #/100mL92%
May 2026Enterococci, monthly average200 #/100mL≤ 35 #/100mL471%
May 2026Oxygen, dissolved [DO], minimum1.11 mg/L≥ 5.5 mg/L80%
May 2026Phosphorus, total [as P], daily maximum.49 mg/L≤ .05 mg/L880%
May 2026Turbidity, daily maximum3.51 NTU≤ 3 NTU—
June 2026BOD, 5-day, 20 deg. C, monthly average266 mg/L≤ 30 mg/L787%
June 2026BOD, 5-day, 20 deg. C, weekly average266 mg/L≤ 45 mg/L491%
June 2026BOD, 5-day, percent removal, monthly average minimum0 %≥ 85 %567%
June 2026Coliform, fecal general, monthly average20000 #/100mL≤ 70 #/100mL28471%
June 2026Oxygen, dissolved [DO], minimum1.23 mg/L≥ 5.5 mg/L78%
June 2026Phosphorus, total [as P], daily maximum2.28 mg/L≤ .05 mg/L4460%
June 2026Solids, suspended percent removal, monthly average minimum72.2 %≥ 85 %85%
June 2026Solids, total suspended, monthly average60 mg/L≤ 30 mg/L100%
June 2026Solids, total suspended, weekly average60 mg/L≤ 45 mg/L33%
June 2026Turbidity, daily maximum267 NTU≤ 3 NTU—
July 2026Oxygen, dissolved [DO], minimum1.11 mg/L≥ 5.5 mg/L80%
July 2026pH, minimum6.9 SU≥ 7 SU—
August 2026BOD, 5-day, percent removal, monthly average minimum36.2 %≥ 85 %325%
August 2026Coliform, fecal general, monthly average20000 #/100mL≤ 70 #/100mL28471%
August 2026Enterococci, daily maximum3777 #/100mL≤ 104 #/100mL3532%
August 2026Enterococci, monthly average3777 #/100mL≤ 35 #/100mL10691%
August 2026Oxygen, dissolved [DO], minimum1.2 mg/L≥ 5.5 mg/L78%
August 2026Phosphorus, total [as P], daily maximum2.15 mg/L≤ .05 mg/L4200%
August 2026Solids, suspended percent removal, monthly average minimum12.5 %≥ 85 %483%
August 2026Solids, total suspended, monthly average86.3 mg/L≤ 30 mg/L188%
August 2026Solids, total suspended, weekly average86.3 mg/L≤ 45 mg/L92%
August 2026Temperature, water deg. centigrade, daily maximum32.5 deg C≤ 32 deg C2%

Limits in force (45)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximum≤ 32 deg Call year001
Turbiditydaily maximum≤ 3 NTUall year001
Oxygen, dissolved [DO]minimum≥ 5.5 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
pHminimum≥ 7 SUall year001
pHmaximum≤ 8.3 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximum≤ .05 mg/Lall year001
Radium 226, totaldaily maximum≤ 3 pCi/Lall year001
Strontium 90, totaldaily maximum≤ 10 pCi/Lall year001
Flow, in conduit or thru treatment plantminimum annual average≥ .75 MGDall year001
Flow, in conduit or thru treatment plantmonthly average≤ .75 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 1.2 MGDall year001
Chlorine, total residualweekly average≤ .075 mg/Lall year001
Chlorine, total residualdaily maximum≤ .013 mg/Lall year001
Enterococcimonthly average≤ 35 #/100mLall year001
Enterococcidaily maximum≤ 104 #/100mLall year001
Coliform, fecal generalmonthly average≤ 70 #/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Gross betadaily maximum≤ 1000 pCi/Lall year001
Flow, in conduit or thru treatment plantdaily maximum≤ .023 MGDall year002
Flow, in conduit or thru treatment plantmonthly average≤ .75 MGDall year002
Temperature, water deg. centigradedaily maximumreport only (deg C)all year003
Turbiditydaily maximumreport only (NTU)all year003
Oxygen, dissolved [DO]minimumreport only (mg/L)all year003
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year003
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Oil & Greasedaily maximumreport only (mg/L)all year003
Phosphorus, total [as P]daily maximumreport only (mg/L)all year003
Radium 226, totaldaily maximumreport only (pCi/L)all year003
Strontium 90, totaldaily maximumreport only (pCi/L)all year003
Flow, in conduit or thru treatment plantminimum annual average≥ .75 MGDall year003
Flow, in conduit or thru treatment plantmonthly average≤ .75 MGDall year003
Flow, in conduit or thru treatment plantdaily maximum≤ 1.2 MGDall year003
Chlorine, total residualdaily maximumreport only (mg/L)all year003
Enterococcimonthly averagereport only (#/100mL)all year003
Enterococcidaily maximumreport only (#/100mL)all year003
Coliform, fecal generalmonthly averagereport only (#/100mL)all year003
Gross betadaily maximumreport only (pCi/L)all year003

How strict are these limits?

Cited limits by parameter: we hold no rule of the U.S. Virgin Islands's own; 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/VI0002003 · MCP: https://passage-data.com/mcp