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Tri-City Utilities, Inc.

Sewage treatment plant, O'kean, Arkansas. NPDES permit AR0043486 expired Oct 31, 2024; its limits still apply. Last 12 months: over a limit 9 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
12 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
October 2025Nitrogen, ammonia total [as N], 7-day average13.9 mg/L≤ 7.5 mg/L85%
October 2025Nitrogen, ammonia total [as N], monthly average13.9 mg/L≤ 5 mg/L178%
December 2025Nitrogen, ammonia total [as N], 7-day average21.5 mg/L≤ 14.7 mg/L46%
December 2025Nitrogen, ammonia total [as N], monthly average21.5 mg/L≤ 14.7 mg/L46%
February 2026Nitrogen, ammonia total [as N], monthly average7.02 lb/d≤ 5.9 lb/d19%
May 2026Nitrogen, ammonia total [as N], monthly average6.7 mg/L≤ 5 mg/L34%
July 2026Nitrogen, ammonia total [as N], 7-day average11.7 mg/L≤ 7.5 mg/L56%
July 2026Nitrogen, ammonia total [as N], monthly average11.7 mg/L≤ 5 mg/L134%
July 2026Oxygen, dissolved [DO], instantaneous minimum3.93 mg/L≥ 4 mg/L2%

Limits in force (31)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LMay–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 15 mg/LMay–Oct
Solids, total suspended7-day average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspended7-day average≤ 22.5 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 8 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 6 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 14.7 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct
Nitrogen, ammonia total [as N]7-day average≤ 14.7 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 5.2 mg/LApr
Nitrogen, ammonia total [as N]7-day average≤ 7.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 5.9 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.1 lb/dApr
Nitrogen, ammonia total [as N]monthly average≤ 2 lb/dMay–Oct
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 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≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 22.5 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]7-day average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 8 lb/dJan, Feb, Mar, Apr, Nov, Dec

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/AR0043486 · MCP: https://passage-data.com/mcp