Marshall Co RWSD # 1 — NPDES permit OK0100927: limits, due date and EPA's record

Sewage treatment plant, Kingston, Oklahoma. NPDES permit OK0100927, in force until Apr 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (22)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	minimum	≥ 5 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 15 mg/L	all year
Solids, total suspended	weekly average	≤ 22.5 mg/L	all year
Solids, total suspended	monthly average	≤ 28.8 lb/d	all year
Nitrogen, ammonia total [as N]	monthly average	≤ 2 mg/L	all year
Nitrogen, ammonia total [as N]	weekly average	≤ 3 mg/L	all year
Nitrogen, ammonia total [as N]	monthly average	≤ 3.8 lb/d	all year
Phosphorus, total [as P]	monthly average	≤ 1 mg/L	all year
Phosphorus, total [as P]	weekly average	≤ 1.5 mg/L	all year
Phosphorus, total [as P]	monthly average	≤ 1.9 lb/d	all year
Chloride, dissolved in water	monthly average	≤ 449 mg/L	all year
Chloride, dissolved in water	daily maximum	≤ 534 mg/L	all year
Chloride, dissolved in water	monthly average	≤ 861 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	geometric mean	≤ 126 MPN/100mL	May–Sep
E. coli	daily maximum	≤ 235 MPN/100mL	May–Sep
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 5 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	weekly average	≤ 7.5 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 9.6 lb/d	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/OK0100927 · MCP: https://passage-data.com/mcp