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Milford Town of

Sewage treatment plant, major discharger, Milford, New Hampshire. NPDES permit NH0100471 expired Oct 31, 2025; its limits still apply. Last 12 months: over a limit 33 times (last July 2026), 4 required values missing, 8 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (45 values), form PA monthly (2 values), form T quarterly (13 values), form TA quarterly (12 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
52 values over a limit, 27 required values missing, 7 of 26 reports late

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

All 33 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, total [as Cu], daily maximum29 ug/L≤ 16.2 ug/L79%
October 2025Copper, total [as Cu], monthly average27 ug/L≤ 14.4 ug/L88%
October 2025E. coli, thermotol, MF, MTEC, daily maximum866.4 #/100mL≤ 406 #/100mL113%
October 2025Phosphorus, total [as P], monthly average32.54 lb/d≤ 3 lb/d985%
November 2025Copper, total [as Cu], daily maximum21.6 ug/L≤ 16.2 ug/L33%
November 2025Copper, total [as Cu], monthly average20.8 ug/L≤ 14.4 ug/L44%
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum31 mg/L≤ 25 mg/L24%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average17.61 mg/L≤ 10 mg/L76%
December 2025BOD, carbonaceous [5 day, 20 C], weekly average23.5 mg/L≤ 23 mg/L2%
December 2025Copper, total [as Cu], daily maximum21.8 ug/L≤ 16.2 ug/L35%
December 2025Copper, total [as Cu], monthly average18.05 ug/L≤ 14.4 ug/L25%
December 2025E. coli, thermotol, MF, MTEC, daily maximum2419.6 #/100mL≤ 406 #/100mL496%
December 2025E. coli, thermotol, MF, MTEC, monthly geometric mean220.6 #/100mL≤ 126 #/100mL75%
December 2025Nitrogen, ammonia total [as N], monthly average17.93 mg/L≤ 12.9 mg/L39%
December 2025Solids, total suspended, daily maximum40 mg/L≤ 35 mg/L14%
December 2025Solids, total suspended, monthly average20.68 mg/L≤ 15 mg/L38%
December 2025Solids, total suspended, weekly average31 mg/L≤ 30 mg/L3%
February 2026Copper, total [as Cu], daily maximum20 ug/L≤ 16.2 ug/L23%
February 2026Copper, total [as Cu], monthly average15 ug/L≤ 14.4 ug/L4%
March 2026E. coli, thermotol, MF, MTEC, daily maximum613.1 #/100mL≤ 406 #/100mL51%
April 2026Phosphorus, total [as P], monthly average20.348 lb/d≤ 3 lb/d578%
May 2026Copper, total [as Cu], daily maximum20 ug/L≤ 16.2 ug/L23%
May 2026Copper, total [as Cu], monthly average20 ug/L≤ 14.4 ug/L39%
May 2026Phosphorus, total [as P], monthly average22.549 lb/d≤ 3 lb/d652%
June 2026Copper, total [as Cu], daily maximum20 ug/L≤ 16.2 ug/L23%
June 2026Copper, total [as Cu], monthly average15 ug/L≤ 14.4 ug/L4%
June 2026NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia, monthly average minimum< 6.25 %≥ 38 %—
June 2026Nitrogen, ammonia total [as N], daily maximum229.71 lb/d≤ 179 lb/d28%
June 2026Nitrogen, ammonia total [as N], daily maximum24.6 mg/L≤ 10 mg/L146%
June 2026Nitrogen, ammonia total [as N], monthly average8.35 mg/L≤ 4.1 mg/L104%
July 2026Nitrogen, ammonia total [as N], daily maximum195.01 lb/d≤ 179 lb/d9%
July 2026Nitrogen, ammonia total [as N], daily maximum25 mg/L≤ 10 mg/L150%
July 2026Nitrogen, ammonia total [as N], monthly average16.88 mg/L≤ 4.1 mg/L312%

Limits in force (86)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8 SUall year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 15 mg/LJun–Oct
Solids, total suspendedmonthly average≤ 15 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 25 mg/LJun–Oct
Solids, total suspendedweekly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 30 mg/LJun–Oct
Solids, total suspendeddaily maximum≤ 35 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedmonthly average≤ 269 lb/dJun–Oct
Solids, total suspendedmonthly average≤ 269 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendeddaily maximum≤ 538 lb/dJun–Oct
Solids, total suspendeddaily maximum≤ 628 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 538 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total suspendedweekly average≤ 448 lb/dJun–Oct
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 12.9 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 4.1 mg/LJun–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LJun–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jun–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 179 lb/dJun–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)Apr–Oct
Phosphorus, total [as P]monthly average≤ 3 lb/dApr–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)Apr–Oct
Phosphorus, total [as P]daily maximumreport only (mg/L)Apr–Oct
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Carbon, dissolved organic [as C]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
Cadmium, total [as Cd]monthly average≤ 1.4 ug/Lall year
Cadmium, total [as Cd]daily maximum≤ 3.1 ug/Lall year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Copper, total [as Cu]monthly average≤ 14.4 ug/Lall year
Copper, total [as Cu]daily maximum≤ 16.2 ug/Lall year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Lead, total [as Pb]monthly average≤ 2 ug/Lall year
Lead, total [as Pb]daily maximum≤ 51 ug/Lall year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Aluminum, total [as Al]monthly average≤ 87 ug/Lall year
Aluminum, total [as Al]daily maximumreport only (ug/L)all year
Aluminum, total [as Al]daily maximumreport only (mg/L)all year
Aluminum, total [as Al]daily maximumreport only (mg/L)all year
E. coli, thermotol, MF, MTECmonthly geometric mean≤ 126 #/100mLall year
E. coli, thermotol, MF, MTECdaily maximum≤ 406 #/100mLall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantrolling average≤ 2.15 MGDall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 14 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 23 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 16 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 126 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 179 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 287 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 448 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 251 lb/dJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 412 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
LC50 Static 48Hr Acute Ceriodaphnia dubiamonthly average minimum≥ 100 %all year
LC50 Static 48Hr Acute Pimephales promelasmonthly average minimum≥ 100 %all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiamonthly average minimum≥ 38 %all year
Noel Statre 7Day Chronic Pimephalesmonthly average minimum≥ 38 %all year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/NH0100471 · MCP: https://passage-data.com/mcp