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Museums And Art Galleries, Mystic, Connecticut. NPDES permit CT0020630 expired Mar 31, 2014; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| pH | instantaneous maximum | report only (SU) | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Salinity | instantaneous maximum | report only (mg/L) | all year | 001 |
| Salinity | instantaneous maximum | report only (ppt) | all year | 001 |
| Salinity | instantaneous maximum | report only (ppt) | Jan, Jul | 001 |
| Salinity | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | Jan, Jul | 001 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | 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] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | Jan, Jul | 001 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | Jan, Jul | 001 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | Jan, Jul | 001 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Jan, Jul | 001 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Jan, Jul | 001 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | Jan, Jul | 001 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 001 |
| Flow | daily maximum | ≤ 2500 gal/d | all year | 001 |
| Flow | daily maximum | ≤ 200000 gal/d | all year | 001 |
| Flow | daily maximum | ≤ 2800 gal/d | all year | 001 |
| Flow | daily maximum | ≤ 18500 gal/d | all year | 001 |
| Flow | daily maximum | ≤ 40000 gal/d | all year | 001 |
| Flow | daily maximum | ≤ 3600 gal/d | all year | 001 |
| Flow | daily maximum | ≤ 3600 gal/d | all year | 001 |
| LC50 Static 48Hr Acute D. Pulex | minimum | report only (%) | all year | 001 |
| LC50 Static 48Hr Acute D. Pulex | instantaneous minimum | report only (%) | Jan, Jul | 001 |
| LC50 Static 48Hr Acute D. Pulex | instantaneous minimum | report only (%) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | minimum | report only (%) | all year | 001 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | instantaneous minimum | report only (%) | Jan, Jul | 001 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | instantaneous minimum | report only (%) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| LC50 Static 48Hr Acute Menidia | minimum | report only (%) | all year | 001 |
| LC50 Static 48Hr Acute Menidia | instantaneous minimum | report only (%) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| LC50 Static 48Hr Acute Menidia | instantaneous minimum | report only (%) | Jan, Jul | 001 |
| LC50 Static 48Hr Acute Pimephales promelas | minimum | report only (%) | all year | 001 |
| LC50 Static 48Hr Acute Pimephales promelas | instantaneous minimum | report only (%) | Jan, Jul | 001 |
| LC50 Static 48Hr Acute Pimephales promelas | instantaneous minimum | report only (%) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 002 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 002 |
| Flow | daily maximum | ≤ 409000 gal/d | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov, Dec | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | Jul | 003 |
| Solids, total suspended | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | Jul | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | Jul | 003 |
| Nitrogen, nitrite total [as N] | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | Jul | 003 |
| Nitrogen, nitrate total [as N] | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Jan, Jul | 003 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Copper, total [as Cu] | instantaneous minimum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Copper, total [as Cu] | instantaneous maximum | report only (mg/L) | Jul | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ .02 mg/L | all year | 003 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | Jul | 003 |
| Chlorine, total residual | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | instantaneous maximum | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 003 |
| Flow | daily maximum | ≤ 800000 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 280400 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 43200 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 25000 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 5000 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 280000 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 6500 gal/d | all year | 003 |
| Flow | daily maximum | ≤ 36840 gal/d | all year | 003 |
| LC50 Static 48Hr Acute D. Pulex | instantaneous minimum | report only (%) | Jul | 003 |
| LC50 Static 48Hr Acute D. Pulex | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| LC50 Static 48Hr Acute Pimephales promelas | instantaneous minimum | report only (%) | Jul | 003 |
| LC50 Static 48Hr Acute Pimephales promelas | instantaneous minimum | report only (%) | Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec | 003 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| Chlorine, total residual | instantaneous maximum | ≤ .02 mg/L | all year | 004 |
| Flow rate | instantaneous maximum | ≤ 22000 gal/hr | all year | 005 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 005 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 005 |
| Chlorine, total residual | instantaneous maximum | ≤ .3 mg/L | all year | 005 |
| Chlorine, total residual | instantaneous maximum | ≤ 5.7 g/hr | all year | 005 |
Cited limits by parameter: Connecticut's rules and the federal ones.
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