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Concord-Hall Street City of

Sewage treatment plant, major discharger, Concord, New Hampshire. NPDES permit NH0100901, in force until Aug 31, 2027. Last 12 months: over a limit 3 times (last July 2026), 3 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (33 values), outfall 001 form T quarterly (11 values), outfall 001 form TA quarterly (12 values), outfall PFAS form E quarterly (4 values), outfall PFAS form IF quarterly (4 values), outfall PFAS form SL quarterly (4 values)
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 1 required value missing, 6 of 38 reports late

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

Period endingParameterReportedLimitOver by
March 2026LC50 Static 48Hr Acute Pimephales promelas, monthly average minimum80.6 %≥ 100 %19%
July 2026pH, maximum8.38 SU≤ 8 SU—
July 2026pH, minimum6.41 SU≥ 6.5 SU—

Limits in force (72)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 2527 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 4212 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 3791 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8 SUall year001
pHdaily maximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximum≤ 50 mg/Lall year001
Solids, total suspendedmonthly average≤ 2527 lb/dall year001
Solids, total suspendeddaily maximum≤ 4212 lb/dall year001
Solids, total suspendedweekly average≤ 3791 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Apr–Oct001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Apr–Oct001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Nov, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Apr–Oct001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Apr–Oct001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 199 lb/dApr–Oct001
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year001
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year001
Carbon, dissolved organic [as C]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year001
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Aluminum, total [as Al]daily maximumreport only (mg/L)all year001
Aluminum, total [as Al]daily maximumreport only (mg/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
Flow, in conduit or thru treatment plantrolling average≤ 10.1 MGDall year001
Chlorine, total residualmonthly average≤ .36 mg/Lall year001
Chlorine, total residualdaily maximum≤ .61 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 406 #/100mLall year001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
LC50 Static 48Hr Acute Ceriodaphnia dubiamonthly average minimum≥ 100 %all year001
LC50 Static 48Hr Acute Pimephales promelasmonthly average minimum≥ 100 %all year001
Perfluorooctanoic acid (PFOA)daily maximumreport only (ng/L)all yearPFAS
Perfluorooctanoic acid (PFOA)daily maximumreport only (ng/L)all yearPFAS
Perfluorooctanoic acid (PFOA)daily maximumreport only (ng/g)all yearPFAS
Perfluorononanoic acid (PFNA)daily maximumreport only (ng/L)all yearPFAS
Perfluorononanoic acid (PFNA)daily maximumreport only (ng/L)all yearPFAS
Perfluorononanoic acid (PFNA)daily maximumreport only (ng/g)all yearPFAS
Perfluorohexanesulfonic acid (PFHxS)daily maximumreport only (ng/L)all yearPFAS
Perfluorohexanesulfonic acid (PFHxS)daily maximumreport only (ng/L)all yearPFAS
Perfluorohexanesulfonic acid (PFHxS)daily maximumreport only (ng/g)all yearPFAS
Perfluorooctanesulfonic acid (PFOS)daily maximumreport only (ng/L)all yearPFAS
Perfluorooctanesulfonic acid (PFOS)daily maximumreport only (ng/L)all yearPFAS
Perfluorooctanesulfonic acid (PFOS)daily maximumreport only (ng/g)all yearPFAS

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NH0100901 · MCP: https://passage-data.com/mcp