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Gravel Ridge Sewer Improvement District # 213

Sewage treatment plant, Gravel Ridge, Arkansas. NPDES permit AR0033642, in force until Dec 31, 2028. Last 12 months: over a limit 24 times (last August 2026), 2 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (20 values), form Q quarterly (3 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 6 required values missing, 6 of 16 reports late

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

All 24 values over a limit
Period endingParameterReportedLimitOver by
October 2025pH, minimum5.6 SU≥ 6 SU—
November 2025pH, minimum5.8 SU≥ 6 SU—
December 2025pH, minimum5.3 SU≥ 6 SU—
March 2026pH, minimum4.6 SU≥ 6 SU—
April 2026Nitrogen, ammonia total [as N], 7-day average6.2 mg/L≤ 5.6 mg/L11%
May 2026Coliform, fecal general, 30-day geometric mean619.7 #/100mL≤ 200 #/100mL210%
May 2026Coliform, fecal general, 7-day geometric mean1600 #/100mL≤ 400 #/100mL300%
May 2026Nitrogen, ammonia total [as N], 7-day average7.3 mg/L≤ 5.6 mg/L30%
June 2026Coliform, fecal general, 30-day geometric mean1084.4 #/100mL≤ 200 #/100mL442%
June 2026Coliform, fecal general, 7-day geometric mean2400 #/100mL≤ 400 #/100mL500%
June 2026Solids, total suspended, 7-day average38 mg/L≤ 22.5 mg/L69%
June 2026Solids, total suspended, monthly average23 mg/L≤ 15 mg/L53%
June 2026pH, minimum5.2 SU≥ 6 SU—
July 2026Nitrogen, ammonia total [as N], 7-day average6.5 mg/L≤ 5.6 mg/L16%
July 2026Nitrogen, ammonia total [as N], monthly average5.5 mg/L≤ 5 mg/L10%
August 2026Coliform, fecal general, 30-day geometric mean> 1697 #/100mL≤ 200 #/100mL—
August 2026Coliform, fecal general, 7-day geometric mean> 2400 #/100mL≤ 400 #/100mL—
August 2026Nitrogen, ammonia total [as N], 7-day average11 mg/L≤ 5.6 mg/L96%
August 2026Nitrogen, ammonia total [as N], monthly average44.3 lb/d≤ 17.7 lb/d150%
August 2026Nitrogen, ammonia total [as N], monthly average9.2 mg/L≤ 5 mg/L84%
August 2026Solids, total suspended, 7-day average53 mg/L≤ 22.5 mg/L136%
August 2026Solids, total suspended, monthly average185.7 lb/d≤ 53.2 lb/d249%
August 2026Solids, total suspended, monthly average40 mg/L≤ 15 mg/L167%
August 2026pH, minimum5.2 SU≥ 6 SU—

Limits in force (28)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (%)all year
Flow rate7-day averagereport only (%)all year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspended7-day average≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 53.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 5.6 mg/LApr–Oct
Nitrogen, ammonia total [as N]7-day average≤ 15 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 17.7 lb/dApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 35.4 lb/dJan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolved7-day averagereport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (lb/d)all year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLMay–Sep
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal general7-day geometric mean≤ 400 #/100mLMay–Sep
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Overflowsmonthly totalreport only (occur/mo)all year
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (gal)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 35.4 lb/dall year

How strict are these limits?

Cited limits by parameter: Arkansas's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0033642 · MCP: https://passage-data.com/mcp