CITY OF CHINOOK

NPDES permit MT0030473 · Minor POTW · expired, expires 2024-03-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2024-03-31 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit

0required values missing, on 0 form(s)

2of 11 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Outfall 001, form A (POTABLE WTP DISCHARGE): every 1 month(s), 10 values

Limits in force (10)

Outfall	Parameter	Statistic	Limit	Months
001	Flow rate	MO AVG	report only	all year
001	Flow rate	DAILY MX	report only	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Solids, total suspended	MO AVG	<= 30 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
001	Aluminum, dissolved [as Al]	MO AVG	report only	all year
001	Aluminum, dissolved [as Al]	DAILY MX	<= .75 mg/L	all year
001	Chlorine, total residual	MO AVG	<= .11 mg/L	all year
001	Chlorine, total residual	DAILY MX	<= .1 mg/L	all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states