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Sewage treatment plant, Merizo, Guam. NPDES permit GU0020273 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 30 times (last June 2026), 13 of 39 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, 5-day, percent removal, monthly average minimum | 78 % | ≥ 85 % | 47% |
| October 2025 | Flow, in conduit or thru treatment plant, monthly average | .67 MGD | ≤ .39 MGD | 72% |
| October 2025 | Flow, minimum flow range, minimum | .6 cfs | ≥ 1.5 cfs | 60% |
| November 2025 | BOD, 5-day, percent removal, monthly average minimum | 83 % | ≥ 85 % | 13% |
| November 2025 | Flow, in conduit or thru treatment plant, monthly average | .42 MGD | ≤ .39 MGD | 8% |
| November 2025 | Flow, minimum flow range, minimum | .7 cfs | ≥ 1.5 cfs | 53% |
| November 2025 | Solids, suspended percent removal, monthly average minimum | 64 % | ≥ 85 % | 140% |
| December 2025 | BOD, 5-day, percent removal, monthly average minimum | 74 % | ≥ 85 % | 73% |
| December 2025 | Flow, in conduit or thru treatment plant, monthly average | .48 MGD | ≤ .39 MGD | 23% |
| December 2025 | Flow, minimum flow range, minimum | .5 cfs | ≥ 1.5 cfs | 67% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 13.98 Ratio | ≤ 7 Ratio | 100% |
| December 2025 | Phosphate, ortho [as PO4], monthly average | 1.66 mg/L | ≤ .7 mg/L | 137% |
| December 2025 | Solids, suspended percent removal, monthly average minimum | -3052 % | ≥ 85 % | 20913% |
| December 2025 | Solids, total suspended, weekly average | 314 lb/d | ≤ 211 lb/d | 49% |
| January 2026 | BOD, 5-day, percent removal, monthly average minimum | 77 % | ≥ 85 % | 53% |
| January 2026 | Flow, minimum flow range, minimum | .7 cfs | ≥ 1.5 cfs | 53% |
| January 2026 | Solids, suspended percent removal, monthly average minimum | 83 % | ≥ 85 % | 13% |
| February 2026 | BOD, 5-day, percent removal, monthly average minimum | 76 % | ≥ 85 % | 60% |
| February 2026 | Flow, in conduit or thru treatment plant, monthly average | .49 MGD | ≤ .39 MGD | 26% |
| February 2026 | Flow, minimum flow range, minimum | .7 cfs | ≥ 1.5 cfs | 53% |
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 71 % | ≥ 85 % | 93% |
| March 2026 | Flow, in conduit or thru treatment plant, monthly average | .54 MGD | ≤ .39 MGD | 38% |
| March 2026 | Flow, minimum flow range, minimum | 1.1 cfs | ≥ 1.5 cfs | 27% |
| April 2026 | BOD, 5-day, percent removal, monthly average minimum | 73 % | ≥ 85 % | 80% |
| April 2026 | Flow, in conduit or thru treatment plant, monthly average | .64 MGD | ≤ .39 MGD | 64% |
| April 2026 | Flow, minimum flow range, minimum | .6 cfs | ≥ 1.5 cfs | 60% |
| April 2026 | Solids, suspended percent removal, monthly average minimum | 68 % | ≥ 85 % | 113% |
| May 2026 | Flow, minimum flow range, minimum | .5 cfs | ≥ 1.5 cfs | 67% |
| May 2026 | Solids, suspended percent removal, monthly average minimum | 75 % | ≥ 85 % | 67% |
| June 2026 | Flow, minimum flow range, minimum | .6 cfs | ≥ 1.5 cfs | 60% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 004 |
| Flow, minimum flow range | minimum | ≥ 1.5 cfs | all year | 004 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 146 lb/d | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 211 lb/d | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 8.5 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 004 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | 004 |
| Solids, total suspended | monthly average | ≤ 146 lb/d | all year | 004 |
| Solids, total suspended | weekly average | ≤ 211 lb/d | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7 Ratio | all year | 004 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 4.6 mg/L | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphate, ortho [as PO4] | monthly average | ≤ .7 mg/L | all year | 004 |
| Phosphate, ortho [as PO4] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphate, ortho [as PO4] | daily maximum | report only (mg/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ .39 MGD | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chlorine, total residual | monthly average | ≤ 6.1 ug/L | all year | 004 |
| Chlorine, total residual | daily maximum | ≤ 12 ug/L | all year | 004 |
| Enterococci | monthly average | ≤ 35 CFU/100mL | all year | 004 |
| Enterococci | daily maximum | ≤ 108 CFU/100mL | all year | 004 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 004 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 004 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (pass=0;fail=1) | all year | 004 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (pass=0;fail=1) | all year | 004 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | monthly average | report only (pass=0;fail=1) | all year | 004 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (pass=0;fail=1) | all year | 004 |
| Pass/Fail Static 96Hr Chronic Selen. Capricornutum | monthly average | report only (pass=0;fail=1) | all year | 004 |
| Pass/Fail Static 96Hr Chronic Selen. Capricornutum | daily maximum | report only (pass=0;fail=1) | all year | 004 |
| Oil & grease, total recoverable | monthly average | ≤ 10 mg/L | all year | 004A |
| Oil & grease, total recoverable | daily maximum | ≤ 15 mg/L | all year | 004A |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 004Y |
| Asbestos | daily maximum | report only (ct/L) | all year | 004Y |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 004Y |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | 004Y |
| Chromium, trivalent [as Cr] | daily maximum | report only (ug/L) | all year | 004Y |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| 2-Methyl-4,6-dinitrophenol | daily maximum | report only (ug/L) | all year | 004Y |
| Dichlorobromomethane | daily maximum | report only (ug/L) | all year | 004Y |
| Carbon tetrachloride | daily maximum | report only (ug/L) | all year | 004Y |
| 1,2-Dichloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| Bromoform | daily maximum | report only (ug/L) | all year | 004Y |
| Dibromochloromethane | daily maximum | report only (ug/L) | all year | 004Y |
| Chloroform | daily maximum | report only (ug/L) | all year | 004Y |
| Toluene | daily maximum | report only (ug/L) | all year | 004Y |
| Benzene | daily maximum | report only (ug/L) | all year | 004Y |
| .delta.-BHC | daily maximum | report only (ug/L) | all year | 004Y |
| Acenaphthylene | daily maximum | report only (ug/L) | all year | 004Y |
| Acenaphthene | daily maximum | report only (ug/L) | all year | 004Y |
| Acrolein | daily maximum | report only (ug/L) | all year | 004Y |
| Acrylonitrile | daily maximum | report only (ug/L) | all year | 004Y |
| Anthracene | daily maximum | report only (ug/L) | all year | 004Y |
| Benzo[b]fluoranthene | daily maximum | report only (ug/L) | all year | 004Y |
| Benzo[k]fluoranthene | daily maximum | report only (ug/L) | all year | 004Y |
| Benzo[a]pyrene | daily maximum | report only (ug/L) | all year | 004Y |
| Bis[2-chloroethyl] ether | daily maximum | report only (ug/L) | all year | 004Y |
| Bis[2-chloroethoxy]methane | daily maximum | report only (ug/L) | all year | 004Y |
| Bis[2-chloroisopropyl] ether | daily maximum | report only (ug/L) | all year | 004Y |
| Butyl benzyl phthalate | daily maximum | report only (ug/L) | all year | 004Y |
| Chlorobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| Chrysene | daily maximum | report only (ug/L) | all year | 004Y |
| Diethyl phthalate | daily maximum | report only (ug/L) | all year | 004Y |
| Dimethyl phthalate | daily maximum | report only (ug/L) | all year | 004Y |
| 1,2-Diphenylhydrazine | daily maximum | report only (ug/L) | all year | 004Y |
| Endosulfan sulfate | daily maximum | report only (ug/L) | all year | 004Y |
| .beta.-Endosulfan | daily maximum | report only (ug/L) | all year | 004Y |
| .alpha.-Endosulfan | daily maximum | report only (ug/L) | all year | 004Y |
| Endrin aldehyde | daily maximum | report only (ug/L) | all year | 004Y |
| Ethylbenzene | daily maximum | report only (ug/L) | all year | 004Y |
| Fluoranthene | daily maximum | report only (ug/L) | all year | 004Y |
| Fluorene | daily maximum | report only (ug/L) | all year | 004Y |
| Hexachlorocyclopentadiene | daily maximum | report only (ug/L) | all year | 004Y |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year | 004Y |
| Hexachloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| Indeno[1,2,3-cd]pyrene | daily maximum | report only (ug/L) | all year | 004Y |
| Isophorone | daily maximum | report only (ug/L) | all year | 004Y |
| Methyl bromide [Bromomethane] | daily maximum | report only (ug/L) | all year | 004Y |
| Methyl chloride [Chloromethane] | daily maximum | report only (ug/L) | all year | 004Y |
| Methylene chloride | daily maximum | report only (ug/L) | all year | 004Y |
| N-Nitrosodi-N-propylamine | daily maximum | report only (ug/L) | all year | 004Y |
| N-Nitrosodiphenylamine | daily maximum | report only (ug/L) | all year | 004Y |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | 004Y |
| Nitrobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| Phenanthrene | daily maximum | report only (ug/L) | all year | 004Y |
| Pyrene | daily maximum | report only (ug/L) | all year | 004Y |
| Tetrachloroethylene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,1-Dichloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| 1,1-Dichloroethylene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,1,1-Trichloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| 1,1,2-Trichloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| 1,1,2,2-Tetrachloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| Benzo[ghi]perylene | daily maximum | report only (ug/L) | all year | 004Y |
| Benzo[a]anthracene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,2-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,2-Dichloropropane | daily maximum | report only (ug/L) | all year | 004Y |
| trans-1,2-Dichloroethylene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,2,4-Trichlorobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| Dibenz[a,h]anthracene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,3-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| 1,4-Dichlorobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| 2-Chloroethyl vinyl ether, [mixed] | daily maximum | report only (ug/L) | all year | 004Y |
| 2-Chloronaphthalene | daily maximum | report only (ug/L) | all year | 004Y |
| 2-Chlorophenol | daily maximum | report only (ug/L) | all year | 004Y |
| 2-Nitrophenol | daily maximum | report only (ug/L) | all year | 004Y |
| Di-n-octyl phthalate | daily maximum | report only (ug/L) | all year | 004Y |
| 2,4-Dichlorophenol | daily maximum | report only (ug/L) | all year | 004Y |
| 2,4-Dimethylphenol | daily maximum | report only (ug/L) | all year | 004Y |
| 2,4-Dinitrotoluene | daily maximum | report only (ug/L) | all year | 004Y |
| 2,4-Dinitrophenol | daily maximum | report only (ug/L) | all year | 004Y |
| 2,4,6-Trichlorophenol | daily maximum | report only (ug/L) | all year | 004Y |
| 2,6-Dinitrotoluene | daily maximum | report only (ug/L) | all year | 004Y |
| 3,3'-Dichlorobenzidine | daily maximum | report only (ug/L) | all year | 004Y |
| 4-Bromophenyl phenyl ether | daily maximum | report only (ug/L) | all year | 004Y |
| 4-Chlorophenyl phenyl ether | daily maximum | report only (ug/L) | all year | 004Y |
| 4-Nitrophenol | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1016 | daily maximum | report only (ug/L) | all year | 004Y |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | daily maximum | report only (ug/L) | all year | 004Y |
| Phenol | daily maximum | report only (ug/L) | all year | 004Y |
| Naphthalene | daily maximum | report only (ug/L) | all year | 004Y |
| Pentachlorophenol | daily maximum | report only (ug/L) | all year | 004Y |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | 004Y |
| Di-n-butyl phthalate | daily maximum | report only (ug/L) | all year | 004Y |
| Benzidine | daily maximum | report only (ug/L) | all year | 004Y |
| Vinyl chloride | daily maximum | report only (ug/L) | all year | 004Y |
| Trichloroethylene | daily maximum | report only (ug/L) | all year | 004Y |
| 4,4'-DDT | daily maximum | report only (ug/L) | all year | 004Y |
| 4,4'-DDD | daily maximum | report only (ug/L) | all year | 004Y |
| 4,4'-DDE | daily maximum | report only (ug/L) | all year | 004Y |
| Aldrin | daily maximum | report only (ug/L) | all year | 004Y |
| .alpha.-BHC | daily maximum | report only (ug/L) | all year | 004Y |
| .beta.-BHC | daily maximum | report only (ug/L) | all year | 004Y |
| .gamma.-BHC | daily maximum | report only (ug/L) | all year | 004Y |
| Chlordane [tech mix. and metabolites] | daily maximum | report only (ug/L) | all year | 004Y |
| Dieldrin | daily maximum | report only (ug/L) | all year | 004Y |
| Endrin | daily maximum | report only (ug/L) | all year | 004Y |
| Toxaphene | daily maximum | report only (ug/L) | all year | 004Y |
| Heptachlor | daily maximum | report only (ug/L) | all year | 004Y |
| Heptachlor epoxide | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1221 | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1232 | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1242 | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1248 | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1254 | daily maximum | report only (ug/L) | all year | 004Y |
| PCB-1260 | daily maximum | report only (ug/L) | all year | 004Y |
| Hexachlorobenzene | daily maximum | report only (ug/L) | all year | 004Y |
| 4-Chloro-3-methylphenol | daily maximum | report only (ug/L) | all year | 004Y |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 004Y |
| 1,3-Dichloropropene | daily maximum | report only (ug/L) | all year | 004Y |
| Chloroethane | daily maximum | report only (ug/L) | all year | 004Y |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | INF |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | weekly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (lb/d) | all year | INF |
| Solids, total suspended | weekly average | report only (lb/d) | all year | INF |
Cited limits by parameter: we hold no rule of Guam's own; the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/GU0020273 · MCP: https://passage-data.com/mcp