Tyronza, City of - Tyronza Waterworks — NPDES permit AR0035637: limits, due date and EPA's record

Sewage treatment plant, Tyronza, Arkansas. NPDES permit AR0035637, in force until Feb 28, 2031. Last 12 months: over a limit 3 times (last June 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
April 2026	Solids, total suspended, 7-day average	160 mg/L	≤ 135 mg/L	19%
April 2026	Solids, total suspended, monthly average	160 mg/L	≤ 90 mg/L	78%
June 2026	E. coli, 30-day geometric mean	139 #/100mL	≤ 126 #/100mL	10%

Limits in force (17)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	instantaneous minimum	≥ 3 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year
BOD, 5-day, 20 deg. C	7-day average	≤ 45 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 30 lb/d	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 10 SU	all year
Solids, total suspended	monthly average	≤ 90 mg/L	all year
Solids, total suspended	7-day average	≤ 135 mg/L	all year
Solids, total suspended	monthly average	≤ 90.1 lb/d	all year
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
E. coli	30-day geometric mean	≤ 126 #/100mL	Apr–Oct
E. coli	30-day geometric mean	≤ 630 #/100mL	Jan, Feb, Mar, Nov, Dec
E. coli	7-day geometric mean	≤ 410 #/100mL	Apr–Oct
E. coli	7-day geometric mean	≤ 2050 #/100mL	Jan, Feb, Mar, Nov, Dec
Overflows	monthly total	report only (occur/mo)	all year
Overflow volume [SS0 volume, CSO volume]	monthly total	report only (gal)	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/AR0035637 · MCP: https://passage-data.com/mcp