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Sewage treatment plant, major discharger, Portsmouth, New Hampshire. NPDES permit NH0100234, in force until Nov 30, 2028. Last 12 months: over a limit 6 times (last July 2026), 2 required values missing, 3 of 73 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Enterococci, daily maximum | 396.8 #/100mL | ≤ 104 #/100mL | 282% |
| January 2026 | Coliform, fecal - % samples exceeding limit, daily maximum | 16.1 % | ≤ 10 % | 61% |
| February 2026 | Coliform, fecal - % samples exceeding limit, daily maximum | 25 % | ≤ 10 % | 150% |
| March 2026 | Coliform, fecal - % samples exceeding limit, daily maximum | 38.71 % | ≤ 10 % | 287% |
| March 2026 | Coliform, fecal general, monthly geometric mean | 15 #/100mL | ≤ 14 #/100mL | 7% |
| July 2026 | pH, minimum | 6.3 SU | ≥ 6.5 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 1534 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 2301 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8 SU | all year | 001 |
| pH | daily maximum | report only (SU) | all year | 001 |
| Salinity | daily maximum | report only (ppt) | all year | 001 |
| Salinity | daily maximum | report only (ppt) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 1534 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Solids, total suspended | weekly average | ≤ 2301 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 001 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, total [as CN] | monthly average | ≤ 2.45 lb/d | all year | 001 |
| Arsenic, Inorganic | daily maximum | report only (ug/L) | Apr–Sep | 001 |
| Arsenic, Inorganic | daily maximum | report only (ug/L) | Apr–Sep | 001 |
| Arsenic, total [as As] | monthly average | ≤ .36 lb/d | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | Apr–Sep | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Coliform, fecal - % samples exceeding limit | daily maximum | ≤ 10 % | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | rolling average | ≤ 6.13 MGD | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .31 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .54 mg/L | all year | 001 |
| Enterococci | monthly geometric mean | ≤ 35 #/100mL | all year | 001 |
| Enterococci | daily maximum | ≤ 104 #/100mL | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 14 #/100mL | all year | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | minimum | ≥ 100 % | all year | 001 |
| LC50 Static 48Hr Acute Menidia | minimum | ≥ 100 % | all year | 001 |
| Duration | monthly total | report only (hr/mo) | all year | 013 |
| Flow, in conduit or thru treatment plant | monthly total | report only (gal/mo) | all year | 013 |
| Number of Events | monthly total | report only (#) | all year | 013 |
| Enterococci | maximum | report only (#/100mL) | all year | 013 |
| Coliform, fecal general | maximum | report only (#/100mL) | all year | 013 |
| Duration | monthly total | report only (hr/mo) | all year | 10A |
| Flow, in conduit or thru treatment plant | monthly total | report only (gal/mo) | all year | 10A |
| Number of Events | monthly total | report only (#) | all year | 10A |
| Enterococci | maximum | report only (#/100mL) | all year | 10A |
| Coliform, fecal general | maximum | report only (#/100mL) | all year | 10A |
| Duration | monthly total | report only (hr/mo) | all year | 10B |
| Flow, in conduit or thru treatment plant | monthly total | report only (gal/mo) | all year | 10B |
| Number of Events | monthly total | report only (#) | all year | 10B |
| Enterococci | maximum | report only (#/100mL) | all year | 10B |
| Coliform, fecal general | maximum | report only (#/100mL) | all year | 10B |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/g) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/g) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/g) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/g) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/g) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/g) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/g) | all year | PFAS |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year | PFAS |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/g) | all year | PFAS |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | PFAS |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | PFAS |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/g) | all year | PFAS |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year | PFAS |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year | PFAS |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/g) | all year | PFAS |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year | PFAS |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year | PFAS |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/g) | all year | PFAS |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/g) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year | PFAS |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/g) | all year | PFAS |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/g) | all year | PFAS |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year | PFAS |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year | PFAS |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/g) | all year | PFAS |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year | PFAS |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year | PFAS |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/g) | all year | PFAS |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/g) | all year | PFAS |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year | PFAS |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/g) | all year | PFAS |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year | PFAS |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/g) | all year | PFAS |
Cited limits by parameter: New Hampshire's rules and the federal ones.
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