Bald Knob, City of — NPDES permit AR0035807: limits, due date and EPA's record

Bald Knob, City of

Sewage treatment plant, Bald Knob, Arkansas. NPDES permit AR0035807, in force until Nov 30, 2026. Last 12 months: over a limit 31 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 25 days after each period: form A monthly (18 values)

Renewal application due

Jun 3, 2026 · 180 days before expiry; your permit may set another date

Last report on file

August 2026

Oct 2024 – Sep 2025

22 values over a limit, 0 required values missing, 1 of 12 reports late

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

All 31 values over a limit

Period ending	Parameter	Reported	Limit	Over by
October 2025	pH, minimum	4.65 SU	≥ 6 SU	—
November 2025	pH, minimum	4.2 SU	≥ 6 SU	—
December 2025	Coliform, fecal general, 30-day geometric mean	1221 #/100mL	≤ 1000 #/100mL	22%
December 2025	Nitrogen, ammonia total [as N], 7-day average	19.9 mg/L	≤ 7.5 mg/L	165%
December 2025	Nitrogen, ammonia total [as N], monthly average	15.17 mg/L	≤ 5 mg/L	203%
December 2025	Solids, total suspended, 7-day average	24 mg/L	≤ 22.5 mg/L	7%
December 2025	Solids, total suspended, monthly average	16.3 mg/L	≤ 15 mg/L	9%
January 2026	Solids, total suspended, 7-day average	27 mg/L	≤ 22.5 mg/L	20%
January 2026	pH, minimum	3.71 SU	≥ 6 SU	—
February 2026	Nitrogen, ammonia total [as N], 7-day average	12.5 mg/L	≤ 7.5 mg/L	67%
February 2026	Nitrogen, ammonia total [as N], monthly average	6.83 mg/L	≤ 5 mg/L	37%
February 2026	Solids, total suspended, 7-day average	27 mg/L	≤ 22.5 mg/L	20%
March 2026	pH, minimum	4.87 SU	≥ 6 SU	—
April 2026	Nitrogen, ammonia total [as N], 7-day average	9 mg/L	≤ 5.2 mg/L	73%
April 2026	Nitrogen, ammonia total [as N], monthly average	5.63 mg/L	≤ 5 mg/L	13%
April 2026	pH, minimum	3.45 SU	≥ 6 SU	—
May 2026	Coliform, fecal general, 30-day geometric mean	446 #/100mL	≤ 200 #/100mL	123%
May 2026	Coliform, fecal general, 7-day geometric mean	870 #/100mL	≤ 400 #/100mL	118%
May 2026	Solids, total suspended, 7-day average	29 mg/L	≤ 22.5 mg/L	29%
May 2026	Solids, total suspended, monthly average	16.7 mg/L	≤ 15 mg/L	11%
June 2026	Coliform, fecal general, 30-day geometric mean	> 531 #/100mL	≤ 200 #/100mL	—
June 2026	Coliform, fecal general, 7-day geometric mean	> 2000 #/100mL	≤ 400 #/100mL	—
June 2026	Nitrogen, ammonia total [as N], 7-day average	7.5 mg/L	≤ 5.2 mg/L	44%
July 2026	Coliform, fecal general, 30-day geometric mean	450 #/100mL	≤ 200 #/100mL	125%
July 2026	Coliform, fecal general, 7-day geometric mean	1104 #/100mL	≤ 400 #/100mL	176%
July 2026	Nitrogen, ammonia total [as N], 7-day average	8.4 mg/L	≤ 5.2 mg/L	62%
August 2026	Coliform, fecal general, 30-day geometric mean	980 #/100mL	≤ 200 #/100mL	390%
August 2026	Coliform, fecal general, 7-day geometric mean	1510 #/100mL	≤ 400 #/100mL	278%
August 2026	Nitrogen, ammonia total [as N], 7-day average	7.5 mg/L	≤ 5.2 mg/L	44%
August 2026	Nitrogen, ammonia total [as N], monthly average	6.27 mg/L	≤ 4 mg/L	57%
August 2026	pH, minimum	3.82 SU	≥ 6 SU	—

Limits in force (26)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	instantaneous minimum	≥ 6 mg/L	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 15 mg/L	all year
Solids, total suspended	7-day average	≤ 22.5 mg/L	all year
Solids, total suspended	monthly average	≤ 84.4 lb/d	all year
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	May–Oct
Nitrogen, ammonia total [as N]	monthly average	≤ 5 mg/L	Jan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]	monthly average	≤ 5 mg/L	Apr
Nitrogen, ammonia total [as N]	7-day average	≤ 5.2 mg/L	May–Oct
Nitrogen, ammonia total [as N]	7-day average	≤ 7.5 mg/L	Jan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]	7-day average	≤ 5.2 mg/L	Apr
Nitrogen, ammonia total [as N]	monthly average	≤ 22.5 lb/d	May–Oct
Nitrogen, ammonia total [as N]	monthly average	≤ 28.1 lb/d	Jan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]	monthly average	≤ 28.1 lb/d	Apr
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Coliform, fecal general	30-day geometric mean	≤ 200 #/100mL	May–Sep
Coliform, fecal general	30-day geometric mean	≤ 1000 #/100mL	Jan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general	7-day geometric mean	≤ 400 #/100mL	May–Sep
Coliform, fecal general	7-day geometric mean	≤ 2000 #/100mL	Jan, Feb, Mar, Apr, Oct, Nov, Dec
Overflows	monthly total	report only (occur/mo)	all year
Overflow volume [SS0 volume, CSO volume]	monthly total	report only (gal)	all year
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 15 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	7-day average	≤ 23 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 84.4 lb/d	all year

How strict are these limits?

Oxygen, dissolved [DO], instantaneous minimum at least 6 mg/L — stricter than 75% of 302 other minor POTWs in Arkansas; 14% have the same limit

Solids, total suspended, 7-day average 22.5 mg/L — stricter than 60% of 304 other minor POTWs in Arkansas; 32% have the same limit

Nitrogen, ammonia total [as N], monthly average 4 mg/L — stricter than 58% of 223 other minor POTWs in Arkansas; 18% have the same limit

Your permit document is the final word. As JSON: /api/v1/permits/AR0035807 · MCP: https://passage-data.com/mcp