City of Senoia — NPDES permit GA0050298: limits, due date and EPA's record

City of Senoia

Sewage treatment plant, major discharger, Senoia, Georgia. NPDES permit GA0050298 expired Oct 31, 2025; its limits still apply. Last 12 months: over a limit 44 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 46 days after each period: outfall 001 form B1 monthly (34 values), outfall 002 form B2 monthly (3 values), outfall 003 form B2 monthly (3 values)

Last report on file

September 2026

Oct 2024 – Sep 2025

19 values over a limit, 6 required values missing, 9 of 17 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 44 values over a limit

Period ending	Parameter	Reported	Limit	Over by
October 2025	BOD, 5-day, 20 deg. C, monthly average	10 mg/L	≤ 5 mg/L	100%
October 2025	BOD, 5-day, 20 deg. C, weekly average	16.8 mg/L	≤ 7.5 mg/L	124%
October 2025	Phosphorus, total [as P], monthly average	1.5 mg/L	≤ 1 mg/L	50%
October 2025	Phosphorus, total [as P], weekly average	4.18 mg/L	≤ 1.5 mg/L	179%
November 2025	BOD, 5-day, 20 deg. C, monthly average	9.42 mg/L	≤ 5 mg/L	88%
November 2025	BOD, 5-day, 20 deg. C, weekly average	16.21 mg/L	≤ 7.5 mg/L	116%
November 2025	pH, maximum	8.1 SU	≤ 8 SU	—
December 2025	BOD, 5-day, 20 deg. C, monthly average	15.6 mg/L	≤ 5 mg/L	212%
December 2025	BOD, 5-day, 20 deg. C, weekly average	24.7 mg/L	≤ 7.5 mg/L	229%
January 2026	BOD, 5-day, 20 deg. C, monthly average	13.35 mg/L	≤ 5 mg/L	167%
January 2026	BOD, 5-day, 20 deg. C, weekly average	25.4 mg/L	≤ 7.5 mg/L	239%
January 2026	pH, minimum	5.32 SU	≥ 6 SU	—
February 2026	BOD, 5-day, 20 deg. C, monthly average	10.83 mg/L	≤ 5 mg/L	117%
February 2026	BOD, 5-day, 20 deg. C, weekly average	16.75 mg/L	≤ 7.5 mg/L	123%
February 2026	pH, minimum	5.66 SU	≥ 6 SU	—
March 2026	BOD, 5-day, 20 deg. C, monthly average	8.7 mg/L	≤ 5 mg/L	74%
March 2026	BOD, 5-day, 20 deg. C, weekly average	9.5 mg/L	≤ 7.5 mg/L	27%
March 2026	Nitrogen, ammonia total [as N], weekly average	.93 mg/L	≤ .75 mg/L	24%
March 2026	pH, maximum	8.44 SU	≤ 8 SU	—
April 2026	BOD, 5-day, 20 deg. C, monthly average	12.71 mg/L	≤ 5 mg/L	154%
April 2026	BOD, 5-day, 20 deg. C, monthly average	24 kg/d	≤ 19 kg/d	26%
April 2026	BOD, 5-day, 20 deg. C, weekly average	16.8 mg/L	≤ 7.5 mg/L	124%
April 2026	BOD, 5-day, 20 deg. C, weekly average	34 kg/d	≤ 23.7 kg/d	43%
May 2026	BOD, 5-day, 20 deg. C, monthly average	7.9 mg/L	≤ 5 mg/L	58%
May 2026	BOD, 5-day, 20 deg. C, weekly average	12.8 mg/L	≤ 7.5 mg/L	71%
May 2026	BOD, 5-day, 20 deg. C, weekly average	27 kg/d	≤ 23.7 kg/d	14%
June 2026	BOD, 5-day, 20 deg. C, monthly average	15.41 mg/L	≤ 5 mg/L	208%
June 2026	BOD, 5-day, 20 deg. C, monthly average	34 kg/d	≤ 19 kg/d	79%
June 2026	BOD, 5-day, 20 deg. C, weekly average	22.8 mg/L	≤ 7.5 mg/L	204%
June 2026	BOD, 5-day, 20 deg. C, weekly average	55 kg/d	≤ 23.7 kg/d	132%
July 2026	BOD, 5-day, 20 deg. C, monthly average	13.39 mg/L	≤ 5 mg/L	168%
July 2026	BOD, 5-day, 20 deg. C, monthly average	30 kg/d	≤ 19 kg/d	58%
July 2026	BOD, 5-day, 20 deg. C, weekly average	17.1 mg/L	≤ 7.5 mg/L	128%
July 2026	BOD, 5-day, 20 deg. C, weekly average	41 kg/d	≤ 23.7 kg/d	73%
July 2026	Phosphorus, total [as P], weekly average	2.13 mg/L	≤ 1.5 mg/L	42%
July 2026	Phosphorus, total [as P], weekly average	4.84 kg/d	≤ 4.7 kg/d	3%
August 2026	BOD, 5-day, 20 deg. C, monthly average	14.67 mg/L	≤ 5 mg/L	193%
August 2026	BOD, 5-day, 20 deg. C, monthly average	30.62 kg/d	≤ 19 kg/d	61%
August 2026	BOD, 5-day, 20 deg. C, weekly average	19.9 mg/L	≤ 7.5 mg/L	165%
August 2026	BOD, 5-day, 20 deg. C, weekly average	39.66 kg/d	≤ 23.7 kg/d	67%
September 2026	BOD, 5-day, 20 deg. C, monthly average	27.24 mg/L	≤ 5 mg/L	445%
September 2026	BOD, 5-day, 20 deg. C, monthly average	58.5 kg/d	≤ 19 kg/d	208%
September 2026	BOD, 5-day, 20 deg. C, weekly average	37.2 mg/L	≤ 7.5 mg/L	396%
September 2026	BOD, 5-day, 20 deg. C, weekly average	69.2 kg/d	≤ 23.7 kg/d	192%

Limits in force (40)

Parameter	Statistic	Limit	Months	Outfall
Oxygen, dissolved [DO]	minimum	≥ 6 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 5 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 7.5 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 19 kg/d	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 23.7 kg/d	all year	001
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	weekly average	report only (mg/L)	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 8 SU	all year	001
Solids, total suspended	monthly average	≤ 10 mg/L	all year	001
Solids, total suspended	weekly average	≤ 15 mg/L	all year	001
Solids, total suspended	monthly average	≤ 37.9 kg/d	all year	001
Solids, total suspended	weekly average	≤ 47.4 kg/d	all year	001
Solids, total suspended	monthly average	report only (mg/L)	all year	001
Solids, total suspended	weekly average	report only (mg/L)	all year	001
Nitrogen, organic total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ .5 mg/L	all year	001
Nitrogen, ammonia total [as N]	weekly average	≤ .75 mg/L	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.9 kg/d	all year	001
Nitrogen, ammonia total [as N]	weekly average	≤ 2.4 kg/d	all year	001
Nitrogen, Kjeldahl, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrite + Nitrate total [as N]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	≤ 1 mg/L	all year	001
Phosphorus, total [as P]	weekly average	≤ 1.5 mg/L	all year	001
Phosphorus, total [as P]	monthly average	≤ 3.8 kg/d	all year	001
Phosphorus, total [as P]	weekly average	≤ 4.7 kg/d	all year	001
Phosphate, ortho [as P]	monthly average	report only (mg/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	≤ 1 MGD	all year	001
Flow, in conduit or thru treatment plant	weekly average	≤ 1.25 MGD	all year	001
Coliform, fecal general	monthly geometric mean	≤ 200 #/100mL	all year	001
Coliform, fecal general	weekly geometric mean	≤ 400 #/100mL	all year	001
Solids, sludge, total, dry weight	monthly total	report only (dry ton)	all year	001
BOD, 5-day, percent removal	minimum	≥ 85 %	all year	001
Solids, suspended percent removal	minimum	≥ 85 %	all year	001
Temperature, water deg. fahrenheit	minimum	report only (deg F)	May–Oct	002
Temperature, water deg. fahrenheit	maximum	report only (deg F)	May–Oct	002
Oxygen, dissolved [DO]	minimum	report only (mg/L)	May–Oct	002
Temperature, water deg. fahrenheit	minimum	report only (deg F)	May–Oct	003
Temperature, water deg. fahrenheit	maximum	report only (deg F)	May–Oct	003
Oxygen, dissolved [DO]	minimum	report only (mg/L)	May–Oct	003

How strict are these limits?

pH, maximum 8 SU — stricter than 88% of 153 other major POTWs in Georgia; 10% have the same limit

Nitrogen, ammonia total [as N], weekly average .75 mg/L — stricter than 84% of 161 other major POTWs in Georgia; 10% have the same limit

Nitrogen, ammonia total [as N], monthly average .5 mg/L — stricter than 82% of 161 other major POTWs in Georgia; 12% have the same limit

Your permit document is the final word. As JSON: /api/v1/permits/GA0050298 · MCP: https://passage-data.com/mcp