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Sewage treatment plant, major discharger, Ridgeland, South Carolina. NPDES permit SC0047279, in force until Oct 31, 2029. Last 12 months: over a limit once (last February 2026), 4 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| February 2026 | pH, minimum | 6.3 | ≥ 6.5 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 4 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 22.5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 938 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 1407 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 22.5 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 938 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 1407 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, organic total [as N] | weekly average | report only (mg/L) | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, organic total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.23 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.93 mg/L | Mar–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6.35 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.9 mg/L | Mar–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 265 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 121 lb/d | Mar–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 398 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 181 lb/d | Mar–Oct | 001 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | weekly average | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, nitrate total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Phosphate, total [as PO4] | monthly average | report only (mg/L) | all year | 001 |
| Phosphate, total [as PO4] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphate, total [as PO4] | monthly average | report only (lb/d) | all year | 001 |
| Phosphate, total [as PO4] | daily maximum | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 86300 lb/yr | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (lb/d) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (lb/d) | all year | 001 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | monthly average | report only (lb/d) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (lb/d) | all year | 001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | monthly average | report only (lb/d) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (lb/d) | all year | 001 |
| Arsenic, total [as As] | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | monthly average | report only (lb/d) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (lb/d) | all year | 001 |
| Barium, total [as Ba] | monthly average | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | monthly average | report only (lb/d) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (lb/d) | all year | 001 |
| Cadmium, total [as Cd] | monthly average | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | monthly average | report only (lb/d) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (lb/d) | all year | 001 |
| Chromium, total [as Cr] | monthly average | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | monthly average | report only (lb/d) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (lb/d) | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 001 |
| Iron, total [as Fe] | monthly average | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | monthly average | report only (lb/d) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (lb/d) | all year | 001 |
| Lead, total [as Pb] | monthly average | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | monthly average | report only (lb/d) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (lb/d) | all year | 001 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | monthly average | report only (lb/d) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (lb/d) | all year | 001 |
| Silver, total [as Ag] | monthly average | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | monthly average | report only (lb/d) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | 001 |
| Selenium, total [as Se] | monthly average | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | monthly average | report only (lb/d) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (lb/d) | 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 | weekly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .008 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .013 mg/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .5 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .81 lb/d | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 349 MPN/100mL | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 800 MPN/100mL | all year | 001 |
| Enterococci | 30-day geometric mean | ≤ 35 MPN/100mL | all year | 001 |
| Enterococci | daily maximum | ≤ 104 MPN/100mL | all year | 001 |
| Enterococci | monthly average | ≤ 35 MPN/100mL | all year | 001 |
| Enterococci | daily maximum | ≤ 800 MPN/100mL | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 001 |
| Coliform, fecal general | monthly average | report only (#/100mL) | all year | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | report only (%) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | ≤ 25 % | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | ≤ 40 % | all year | 001 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | report only (%) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 7.5 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year | 002 |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Selenium, total [as Se], daily maximum outfall 001 | 0.02 mg/L | Jan 1, 2028 | new | 0 mg/L (11 values, 1 below detection) | 0× |
| Selenium, total [as Se], daily maximum outfall 001 | 1.5 lb/d | Jan 1, 2028 | new | 0 lb/d (11 values) | 0× |
| Selenium, total [as Se], monthly average outfall 001 | 0.005 mg/L | Jan 1, 2028 | new | 0 mg/L (11 values, 1 below detection) | 0× |
| Selenium, total [as Se], monthly average outfall 001 | 0.38 lb/d | Jan 1, 2028 | new | 0 lb/d (11 values) | 0× |
| Selenium, total [as Se], daily maximum outfall 001 | 1.9 lb/d | Jun 1, 2028 | new | 0 lb/d (11 values) | 0× |
| Selenium, total [as Se], daily maximum outfall 001 | 0.02 mg/L | Jun 1, 2028 | new | 0 mg/L (11 values, 1 below detection) | 0× |
| Selenium, total [as Se], monthly average outfall 001 | 0.47 lb/d | Jun 1, 2028 | new | 0 lb/d (11 values) | 0× |
| Selenium, total [as Se], monthly average outfall 001 | 0.005 mg/L | Jun 1, 2028 | new | 0 mg/L (11 values, 1 below detection) | 0× |
| Flow, in conduit or thru treatment plant, monthly average outfall 002 | 6 MGD | Nov 1, 2028 | tighter | 2.14 MGD (11 values) | 0.357× |
Cited limits by parameter: South Carolina's rules and the federal ones.
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