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Shannon Hills, City of

Sewage treatment plant, Shannon Hills, Arkansas. NPDES permit AR0050636, in force until Aug 31, 2027. Last 12 months: over a limit 8 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (18 values)
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
16 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026Nitrogen, ammonia total [as N], 7-day average14 mg/L≤ 9 mg/L56%
January 2026Nitrogen, ammonia total [as N], monthly average11.5 mg/L≤ 6 mg/L92%
March 2026Nitrogen, ammonia total [as N], 7-day average19.6 mg/L≤ 9 mg/L118%
March 2026Nitrogen, ammonia total [as N], monthly average17.2 mg/L≤ 6 mg/L187%
March 2026Nitrogen, ammonia total [as N], monthly average70.5 lb/d≤ 32.1 lb/d120%
April 2026Nitrogen, ammonia total [as N], 7-day average8.51 mg/L≤ 6.1 mg/L40%
April 2026Nitrogen, ammonia total [as N], monthly average7.34 mg/L≤ 6 mg/L22%
May 2026pH, minimum5.67 SU≥ 6 SU—

Limits in force (24)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 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≤ 80.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 9 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 21.4 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 32.1 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 32.1 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
Coliform, fecal generalmonthly 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≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 23 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 80.2 lb/dall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0050636 · MCP: https://passage-data.com/mcp