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Sewage treatment plant, major discharger, Chatsworth, Georgia. NPDES permit GA0032492, in force until Nov 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | May–Oct |
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | Nov |
| Oxygen, dissolved [DO] | minimum | ≥ 4 mg/L | Jan, Feb, Mar, Apr, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | Jun |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | Jul, Aug |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 5 mg/L | Sep |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 15 mg/L | Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 25 mg/L | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | Jun |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | Jul, Aug |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 7.5 mg/L | Sep |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 22.5 mg/L | Oct |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 37.5 mg/L | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 500 lb/d | Jun |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 250 lb/d | Jul, Aug |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 125 lb/d | Sep |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 375 lb/d | Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 626 lb/d | Nov |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 750 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 626 lb/d | Jun |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 313 lb/d | Jul, Aug |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 156 lb/d | Sep |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 469 lb/d | Oct |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 782 lb/d | Nov |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 939 lb/d | Jan, Feb, Mar, Apr, May, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 751 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 938 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Solids, total suspended | weekly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.7 mg/L | Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 17.4 mg/L | Jan–Mar |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.3 mg/L | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jul–Sep |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 20.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 9.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 26.1 mg/L | Jan–Mar |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 25.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 12.5 mg/L | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3 mg/L | Jul–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 343 lb/d | Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 160 lb/d | Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 80 lb/d | Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 435 lb/d | Jan–Mar |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 420 lb/d | Apr |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 208 lb/d | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 125 lb/d | Jun |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 50 lb/d | Jul–Sep |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 428 lb/d | Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 200 lb/d | Nov |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 100 lb/d | Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 544 lb/d | Jan–Mar |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 525 lb/d | Apr |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 260 lb/d | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 156 lb/d | Jun |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 62.6 lb/d | Jul–Sep |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | weekly average | ≤ 1.5 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 25 lb/d | all year |
| Phosphorus, total [as P] | weekly average | ≤ 31.3 lb/d | all year |
| Copper, total recoverable | monthly average | ≤ 8 ug/L | all year |
| Copper, total recoverable | weekly average | ≤ 10 ug/L | all year |
| Copper, total recoverable | monthly average | ≤ .2 lb/d | all year |
| Copper, total recoverable | weekly average | ≤ .25 lb/d | all year |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 3 MGD | all year |
| Flow, in conduit or thru treatment plant | weekly average | ≤ 3.75 MGD | all year |
| Chlorine, total residual | maximum | ≤ .02 mg/L | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec |
| Chlorine, total residual | maximum | ≤ .01 mg/L | Aug–Oct |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year |
| E. coli | weekly geometric mean | ≤ 410 #/100mL | all year |
| Solids, sludge, total, dry weight | monthly total | report only (dry ton) | all year |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | report only (%) | all year |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | minimum | report only (%) | all year |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | report only (%) | all year |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | minimum | report only (%) | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C, monthly average | 10 mg/L (May–Jul) | tighter | 2.32 mg/L (3 values) | 0.232× |
| BOD, 5-day, 20 deg. C, monthly average | 250 lb/d (May–Jul) | tighter | 22 lb/d (3 values) | 0.088× |
| BOD, 5-day, 20 deg. C, monthly average | 125 lb/d (Aug–Oct) | tighter | 27 lb/d (3 values) | 0.216× |
| BOD, 5-day, 20 deg. C, monthly average | 5 mg/L (Aug–Oct) | tighter | 3.23 mg/L (3 values) | 0.646× |
| BOD, 5-day, 20 deg. C, weekly average | 15 mg/L (May–Jul) | tighter | 2.65 mg/L (3 values) | 0.177× |
| BOD, 5-day, 20 deg. C, weekly average | 313 lb/d (May–Jul) | tighter | 29 lb/d (3 values) | 0.0927× |
| BOD, 5-day, 20 deg. C, weekly average | 156 lb/d (Aug–Oct) | tighter | 76 lb/d (3 values) | 0.487× |
| BOD, 5-day, 20 deg. C, weekly average | 7.5 mg/L (Aug–Oct) | tighter | 6.06 mg/L (3 values) | 0.808× |
| Nitrogen, ammonia total [as N], monthly average | 50 lb/d (May–Oct) | tighter | 0.275 lb/d (6 values) | 0.0055× |
| Nitrogen, ammonia total [as N], monthly average | 2 mg/L (May–Oct) | tighter | 0.0325 mg/L (6 values) | 0.0163× |
| Nitrogen, ammonia total [as N], monthly average | 6.4 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.1665 mg/L (6 values) | 0.026× |
| Nitrogen, ammonia total [as N], monthly average | 160 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 1.465 lb/d (6 values) | 0.00916× |
| Nitrogen, ammonia total [as N], weekly average | 3 mg/L (May–Oct) | tighter | 0.056 mg/L (6 values) | 0.0187× |
| Nitrogen, ammonia total [as N], weekly average | 62.6 lb/d (May–Oct) | tighter | 0.65 lb/d (6 values) | 0.0104× |
| Nitrogen, ammonia total [as N], weekly average | 200 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 10.2 lb/d (6 values) | 0.051× |
| Nitrogen, ammonia total [as N], weekly average | 9.6 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.723 mg/L (6 values) | 0.0753× |
| Solids, total suspended, monthly average | 500 lb/d (May–Jul) | tighter | 7 lb/d (3 values) | 0.014× |
| Solids, total suspended, monthly average | 20 mg/L (May–Jul) | tighter | 0.7 mg/L (3 values) | 0.035× |
| Solids, total suspended, weekly average | 30 mg/L (May–Jul) | tighter | 1 mg/L (3 values) | 0.0333× |
| Solids, total suspended, weekly average | 626 lb/d (May–Jul) | tighter | 11 lb/d (3 values) | 0.0176× |
Cited limits by parameter: Georgia's rules and the federal ones.
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