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John J. Carroll Water Treatment Plant

Water Supply, Boston, Massachusetts. NPDES permit MA0040398 expired Dec 31, 2024; its limits still apply. Last 12 months: no values over a limit, 3 required values missing, 1 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (19 values), form B monthly (13 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (32)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHminimum≥ 6.5 SUall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.3 SUall year
pHmaximum≤ 8.3 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximum≤ 25 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ 25 MGDall year
Chlorine, total residualmonthly average≤ 110 ug/Lall year
Chlorine, total residualmonthly average≤ 110 ug/Lall year
Chlorine, total residualdaily maximum≤ 190 ug/Lall year
Chlorine, total residualdaily maximum≤ 190 ug/Lall year

How strict are these limits?

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

Same industry: the 4 Water Supply permits in Massachusetts.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MA0040398 · MCP: https://passage-data.com/mcp