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City of Mansfield

Water Supply, Mansfield, Ohio. NPDES permit OH0003867, in force until Mar 31, 2029. Last 12 months: over a limit 4 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (8 values), outfall 002 form A monthly (8 values), outfall 003 form A monthly (8 values), outfall 004 form A monthly (8 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingParameterReportedLimitOver by
August 2026Solids, total suspended, daily maximum100≤ 45 mg/L122%
August 2026Solids, total suspended, monthly average100≤ 30 mg/L233%
September 2026Solids, total suspended, daily maximum59≤ 45 mg/L31%
September 2026Solids, total suspended, monthly average59≤ 30 mg/L97%

Limits in force (32)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall 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
Trihalomethane, tot.monthly averagereport only (ug/L)all year001
Trihalomethane, tot.daily maximumreport only (ug/L)all year001
pHdaily minimum≥ 6.5 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendeddaily maximum≤ 45 mg/Lall 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
Trihalomethane, tot.monthly averagereport only (ug/L)all year002
Trihalomethane, tot.daily maximumreport only (ug/L)all year002
pHdaily minimum≥ 6.5 SUall year003
pHdaily maximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Solids, total suspendeddaily maximum≤ 45 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Trihalomethane, tot.monthly averagereport only (ug/L)all year003
Trihalomethane, tot.daily maximumreport only (ug/L)all year003
pHdaily minimum≥ 6.5 SUall year004
pHdaily maximum≤ 9 SUall year004
Solids, total suspendedweekly maximum≤ 30 mg/Lall year004
Solids, total suspendeddaily maximum≤ 45 mg/Lall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Trihalomethane, tot.monthly averagereport only (ug/L)all year004
Trihalomethane, tot.daily maximumreport only (ug/L)all year004

How strict are these limits?

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

Same industry: the 147 Water Supply permits in Ohio.

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Your permit document is the final word. As JSON: /api/v1/permits/OH0003867 · MCP: https://passage-data.com/mcp