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Providence Water Supply Board

Water Supply, Scituate, Rhode Island. NPDES permit RI0021601 expired Feb 29, 2024; its limits still apply. Last 12 months: over a limit 7 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form B monthly (14 values), outfall 001 form Q quarterly (2 values), outfall 002 form A monthly (14 values), outfall 002 form Q quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 32 reports late

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

Period endingParameterReportedLimitOver by
November 2025Iron, total [as Fe], monthly average898 ug/L≤ 800 ug/L12%
December 2025Iron, total [as Fe], monthly average3208 ug/L≤ 800 ug/L301%
December 2025Solids, total suspended, monthly average5.5 mg/L≤ 5 mg/L10%
January 2026Iron, total [as Fe], monthly average845 ug/L≤ 800 ug/L6%
February 2026Iron, total [as Fe], monthly average1990 ug/L≤ 800 ug/L149%
May 2026Iron, total [as Fe], monthly average838 ug/L≤ 800 ug/L5%
September 2026Iron, total [as Fe], monthly average920 ug/L≤ 800 ug/L15%

Limits in force (32)

ParameterStatisticLimitMonthsOutfall
Turbiditymonthly averagereport only (NTU)all year001
Turbiditydaily maximumreport only (NTU)all year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 5 mg/Lall year001
Solids, total suspendeddaily maximum≤ 11 mg/Lall year001
Solids, total suspendedmonthly average≤ 91 lb/dall year001
Solids, total suspendeddaily maximum≤ 218 lb/dall year001
Iron, total [as Fe]monthly average≤ 800 ug/Lall year001
Iron, total [as Fe]daily maximumreport only (ug/L)all year001
Lead, total [as Pb]monthly averagereport only (ug/L)all year001
Lead, total [as Pb]daily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ 20 ug/Lall year001
Chlorine, total residualdaily maximum≤ 20 ug/Lall year001
Turbiditymonthly averagereport only (NTU)all year002
Turbiditydaily maximumreport only (NTU)all year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 5 mg/Lall year002
Solids, total suspendeddaily maximum≤ 11 mg/Lall year002
Solids, total suspendedmonthly average≤ 91 lb/dall year002
Solids, total suspendeddaily maximum≤ 218 lb/dall year002
Iron, total [as Fe]monthly average≤ 800 ug/Lall year002
Iron, total [as Fe]daily maximumreport only (ug/L)all year002
Lead, total [as Pb]monthly averagereport only (ug/L)all year002
Lead, total [as Pb]daily maximumreport only (ug/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ 20 ug/Lall year002
Chlorine, total residualdaily maximum≤ 20 ug/Lall year002

How strict are these limits?

Cited limits by parameter: Rhode Island's rules and the federal ones.

Same industry: the 4 Water Supply permits in Rhode Island.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/RI0021601 · MCP: https://passage-data.com/mcp