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Plating And Polishing, major discharger, Thomaston, Connecticut. NPDES permit CT0001180, in force until Jul 31, 2028. Last 12 months: no values over a limit, 11 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Flow rate | monthly average | ≤ 160000 gal/d | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 50 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 40 lb/d | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 8 SU | all year |
| Alkalinity, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 12.1 kg/d | all year |
| Solids, total suspended | daily maximum | ≤ 18.1 kg/d | all year |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year |
| Oil & Grease | daily maximum | report only (mg/L) | all year |
| Oil & Grease | monthly average | ≤ 6.05 kg/d | all year |
| Oil & Grease | daily maximum | report only (kg/d) | all year |
| Nitrogen, total [as N] | monthly average | ≤ 26.7 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (kg/d) | all year |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year |
| Cyanide, total [as CN] | monthly average | ≤ 51 ug/L | all year |
| Cyanide, total [as CN] | daily maximum | ≤ 137 ug/L | all year |
| Cyanide, total [as CN] | monthly average | ≤ 30 g/d | all year |
| Cyanide, total [as CN] | daily maximum | ≤ 82 g/d | all year |
| Cyanide, free [amenable to chlorination] | monthly average | ≤ .1 mg/L | all year |
| Cyanide, free [amenable to chlorination] | daily maximum | ≤ .2 mg/L | all year |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year |
| Fluoride, total [as F] | monthly average | ≤ 20 mg/L | all year |
| Fluoride, total [as F] | daily maximum | ≤ 30 mg/L | all year |
| Fluoride, total [as F] | monthly average | ≤ 12.1 kg/d | all year |
| Fluoride, total [as F] | daily maximum | ≤ 18.1 kg/d | all year |
| Cadmium, total [as Cd] | monthly average | ≤ .08 ug/L | Mar |
| Cadmium, total [as Cd] | daily maximum | ≤ .2 ug/L | Mar |
| Cadmium, total [as Cd] | monthly average | ≤ .05 g/d | Mar |
| Cadmium, total [as Cd] | daily maximum | ≤ .12 g/d | Mar |
| Chromium, total [as Cr] | monthly average | ≤ 26 ug/L | Feb, Aug |
| Chromium, total [as Cr] | daily maximum | ≤ 68 ug/L | Feb, Aug |
| Chromium, total [as Cr] | monthly average | ≤ 9.5 g/d | Feb, Aug |
| Chromium, total [as Cr] | daily maximum | ≤ 44 g/d | Feb, Aug |
| Copper, total [as Cu] | monthly average | ≤ 148 ug/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ 253 ug/L | all year |
| Copper, total [as Cu] | monthly average | ≤ 101 g/d | all year |
| Copper, total [as Cu] | daily maximum | ≤ 172 g/d | all year |
| Iron, total [as Fe] | monthly average | ≤ 3 mg/L | all year |
| Iron, total [as Fe] | daily maximum | ≤ 5 mg/L | all year |
| Iron, total [as Fe] | monthly average | ≤ 1816 g/d | all year |
| Iron, total [as Fe] | daily maximum | ≤ 3027 g/d | all year |
| Lead, total [as Pb] | monthly average | ≤ 8 ug/L | all year |
| Lead, total [as Pb] | daily maximum | ≤ 21 ug/L | all year |
| Lead, total [as Pb] | monthly average | ≤ 4.8 g/d | all year |
| Lead, total [as Pb] | daily maximum | ≤ 13 g/d | all year |
| Nickel, total [as Ni] | monthly average | ≤ 190 ug/L | all year |
| Nickel, total [as Ni] | daily maximum | ≤ 628 ug/L | all year |
| Nickel, total [as Ni] | monthly average | ≤ 114 g/d | all year |
| Nickel, total [as Ni] | daily maximum | ≤ 377 g/d | all year |
| Silver, total [as Ag] | monthly average | ≤ 32 ug/L | all year |
| Silver, total [as Ag] | daily maximum | ≤ 65 ug/L | all year |
| Silver, total [as Ag] | monthly average | ≤ 22 g/d | all year |
| Silver, total [as Ag] | daily maximum | ≤ 44 g/d | all year |
| Zinc, total [as Zn] | monthly average | ≤ .249 mg/L | all year |
| Zinc, total [as Zn] | daily maximum | ≤ .667 mg/L | all year |
| Zinc, total [as Zn] | monthly average | ≤ 149 g/d | all year |
| Zinc, total [as Zn] | daily maximum | ≤ 400 g/d | all year |
| Tin, total [as Sn] | monthly average | ≤ 2 mg/L | all year |
| Tin, total [as Sn] | daily maximum | ≤ 4 mg/L | all year |
| Tin, total [as Sn] | monthly average | ≤ 1211 g/d | all year |
| Tin, total [as Sn] | daily maximum | ≤ 2422 g/d | all year |
| Aluminum, total [as Al] | monthly average | ≤ 201 ug/L | all year |
| Aluminum, total [as Al] | daily maximum | ≤ 538 ug/L | all year |
| Aluminum, total [as Al] | monthly average | ≤ 122 g/d | all year |
| Aluminum, total [as Al] | daily maximum | ≤ 326 g/d | all year |
| Chloroform | monthly average | report only (ug/L) | all year |
| Chloroform | daily maximum | report only (ug/L) | all year |
| Chloroform | monthly average | report only (g/d) | all year |
| Chloroform | daily maximum | report only (g/d) | all year |
| Flow, maximum during 24 hr period | daily maximum | ≤ 250000 gal/d | all year |
| Chlorine, total residual | monthly average | report only (ug/L) | all year |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year |
| Chlorine, total residual | monthly average | report only (g/d) | all year |
| Chlorine, total residual | daily maximum | report only (g/d) | all year |
| Surfactants, anionic | monthly average | report only (mg/L) | all year |
| Surfactants, anionic | daily maximum | report only (mg/L) | all year |
| pH, maximum | instantaneous maximum | ≤ 8 SU | all year |
| pH, minimum | instantaneous minimum | ≥ 6.5 SU | all year |
| Formaldehyde | monthly average | report only (ug/L) | all year |
| Formaldehyde | daily maximum | report only (ug/L) | all year |
| Gold, total [as Au] | monthly average | ≤ .1 mg/L | all year |
| Gold, total [as Au] | daily maximum | ≤ .5 mg/L | all year |
| Gold, total [as Au] | monthly average | ≤ 61 g/d | all year |
| Gold, total [as Au] | daily maximum | ≤ 303 g/d | all year |
| Flow | daily maximum | ≤ 250000 gal/d | all year |
| Organics, total toxic [TTO] | instantaneous maximum | ≤ 1 mg/L | all year |
| Duration of discharge | monthly average | report only (hr/d) | all year |
| Duration of discharge | daily maximum | report only (hr/d) | all year |
| LC50 Static 48Hr Acute D. Pulex | minimum average | > 46.3 % | Mar, Jun, Sep, Dec |
| LC50 Static 48Hr Acute D. Pulex | daily minimum | > 23 % | Mar, Jun, Sep, Dec |
| LC50 Static 48Hr Acute Pimephales promelas | minimum average | > 46.3 % | Mar, Jun, Sep, Dec |
| LC50 Static 48Hr Acute Pimephales promelas | daily minimum | > 23 % | Mar, Jun, Sep, Dec |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum average | report only (%) | Feb, Aug |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | report only (%) | Feb, Aug |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | minimum average | > 4.6 % | Feb, Aug |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily minimum | > 2.3 % | Feb, Aug |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum average | report only (%) | Feb, Aug |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | report only (%) | Feb, Aug |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | minimum average | > 4.6 % | Feb, Aug |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily minimum | > 2.3 % | Feb, Aug |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Silver, total [as Ag], monthly average | 11 ug/L | tighter | 15 ug/L (11 values) | 1.36× |
| Copper, total [as Cu], daily maximum | 251 ug/L | tighter | 46 ug/L (11 values) | 0.183× |
| Copper, total [as Cu], daily maximum | 151 g/d | tighter | 21.95 g/d (11 values) | 0.145× |
| Copper, total [as Cu], monthly average | 119 ug/L | tighter | 32 ug/L (11 values) | 0.269× |
| Copper, total [as Cu], monthly average | 71 g/d | tighter | 12.9 g/d (11 values) | 0.182× |
| Silver, total [as Ag], daily maximum | 31 ug/L | tighter | 21 ug/L (11 values) | 0.677× |
| Silver, total [as Ag], daily maximum | 19 g/d | tighter | 8.62 g/d (11 values) | 0.454× |
| Silver, total [as Ag], monthly average | 7.1 g/d | tighter | 6.106 g/d (11 values) | 0.86× |
Cited limits by parameter: Connecticut's rules and the federal ones.
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