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Rison , City of

Sewage treatment plant, Rison, Arkansas. NPDES permit AR0021695, in force until Jun 30, 2029. Last 12 months: over a limit 21 times (last August 2026), 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (19 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
26 values over a limit, 0 required values missing, 3 of 12 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
January 2026BOD, carbonaceous [5 day, 20 C], monthly average213.9 lb/d≤ 51.7 lb/d314%
January 2026Nitrogen, ammonia total [as N], 7-day average17.4 mg/L≤ 17 mg/L2%
January 2026Nitrogen, ammonia total [as N], monthly average286.4 lb/d≤ 31 lb/d824%
January 2026Solids, total suspended, monthly average218.7 lb/d≤ 51.7 lb/d323%
May 2026Coliform, fecal general, 7-day geometric mean> 2400 #/100mL≤ 2000 #/100mL—
May 2026Nitrogen, ammonia total [as N], 7-day average190 mg/L≤ 6 mg/L3067%
May 2026Nitrogen, ammonia total [as N], monthly average110 mg/L≤ 4 mg/L2650%
May 2026Nitrogen, ammonia total [as N], monthly average74.4 lb/d≤ 10.3 lb/d622%
May 2026Oxygen, dissolved [DO], instantaneous minimum2.89 mg/L≥ 5 mg/L42%
June 2026Coliform, fecal general, 30-day geometric mean> 1287 #/100mL≤ 1000 #/100mL—
June 2026Coliform, fecal general, 7-day geometric mean> 2400 #/100mL≤ 2000 #/100mL—
June 2026Nitrogen, ammonia total [as N], 7-day average35 mg/L≤ 6 mg/L483%
June 2026Nitrogen, ammonia total [as N], monthly average12.3 lb/d≤ 10.3 lb/d19%
June 2026Nitrogen, ammonia total [as N], monthly average21.1 mg/L≤ 4 mg/L428%
June 2026Oxygen, dissolved [DO], instantaneous minimum2.58 mg/L≥ 5 mg/L48%
June 2026Solids, total suspended, monthly average21 mg/L≤ 20 mg/L5%
July 2026Oxygen, dissolved [DO], instantaneous minimum3.36 mg/L≥ 5 mg/L33%
August 2026Coliform, fecal general, 7-day geometric mean> 2420 #/100mL≤ 2000 #/100mL—
August 2026Oxygen, dissolved [DO], instantaneous minimum4.86 mg/L≥ 5 mg/L3%
August 2026Solids, total suspended, 7-day average56 mg/L≤ 30 mg/L87%
August 2026Solids, total suspended, monthly average45.05 mg/L≤ 20 mg/L125%

Limits in force (25)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspended7-day average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 51.7 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 17 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 10.3 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 31 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 15.8 lb/dApr
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLall year
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≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 51.7 lb/dall year

New limits from Jul 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.011 mg/Lnew0.03 mg/L (8 values, 1 below detection)2.73×

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/AR0021695 · MCP: https://passage-data.com/mcp