Knife River - Knodel Pit — NPDES permit SD0028643: limits, due date and EPA's record

NPDES permit SD0028643 · Minor NON-POTW · administratively continued, expires 2025-11-30 · EPA's file as of 2026-09-19

This permit expired on 2025-11-30 and is administratively continued: 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

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).

Limits in force (26)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. fahrenheit	30DA AVG	report only	all year
001	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
001	Flow rate	30DA AVG	report only	all year
001	Flow rate	DAILY MX	report only	all year
001	pH	DAILY MN	>= 6.5 SU	all year
001	pH	DAILY MX	<= 9 SU	all year
001	Oil and grease, hexane extr method	DAILY MX	<= 10 mg/L	all year
001	Floating solids, waste or visible foam-visual	VALUE	report only	all year
001	Flow, total	TOTAL	report only	all year
001	Suspended Solids, Total	30DA AVG	<= 90 mg/L	all year
001	Suspended Solids, Total	DAILY MX	<= 158 mg/L	all year
001	Duration of discharge	TOTAL	report only	all year
001	Oil and grease visual	VALUE	report only	all year
002	Temperature, water deg. fahrenheit	30DA AVG	report only	all year
002	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
002	Flow rate	30DA AVG	report only	all year
002	Flow rate	DAILY MX	report only	all year
002	pH	DAILY MN	>= 6.5 SU	all year
002	pH	DAILY MX	<= 9 SU	all year
002	Solids, total suspended	30DA AVG	<= 90 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 158 mg/L	all year
002	Oil and grease, hexane extr method	DAILY MX	<= 10 mg/L	all year
002	Floating solids, waste or visible foam-visual	VALUE	report only	all year
002	Flow, total	TOTAL	report only	all year
002	Duration of discharge	TOTAL	report only	all year
002	Oil and grease visual	VALUE	report only	all year