Clean Water Act discharge permit · NPDES NDG523493

MANDAN WTP, Mandan, ND: NPDES NDG523493 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
6Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

MANDAN WTP, held by Mandan WTP, holds NPDES permit NDG523493, which discharges to Lower Heart. EPA’s file records it issued March 15, 2019 and expiring March 31, 2024.

MANDAN WTP, Mandan, North Dakota: Coverage under a general permit NDG523493, held by Mandan WTP; Administratively continued (past its expiration date and still in force until reissued); issued March 15, 2019, term to March 31, 2024, by North Dakota Department of Environmental Quality; discharges to Lower Heart.

Solids, total suspended: 3 limits, 3 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 3 limits, 3 violations of any kind, 0 effluent exceedances.
pH: 2 limits, 2 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 2 limits, 2 violations of any kind, 0 effluent exceedances.
Flow, total: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Duration of discharge: 1 limit, 1 violation of any kind, 0 effluent exceedances.

MANDAN WTP among its neighbors

EPA’s permit file holds 44 discharge permits in the Rock Haven Creek-Missouri River subwatershed (HUC 101301011005), NDG523493 among them. Its county holds 88, 2 of them major permits; NDG523493 is a minor permit.

Other permits in the Rock Haven Creek-Missouri River subwatershed (HUC 101301011005)

AMES CONSTRUCTION FOR BNSF RAILWAY COMPANY, Unknown: NDG071045, minor permit, permit term to March 31, 2030
BIG SKY ESTATES 3RD ADDITION, (Unknown City): NDR111850, minor permit, permit term to March 31, 2025
BISMARCK CITY OF, Bismarck: ND0023434, major permit, discharging to Painted Woods-Square Butte, permit term to June 30, 2023
BISMARCK WTP, Bismarck: ND0027093, minor permit, permit term to June 30, 2031
BISMARCK WTP, Bismarck: NDG520361, minor permit, discharging to Upper Lake Oahe, permit term to March 31, 2024
BNSF RAILWAY COMPANY - BNSF BRIDGE NO. 196.6 OVER MISSOURI RIVER, (Unknown City): NDR112163, minor permit, permit term to March 31, 2025
CHS INC., Mandan: NDR320784, minor permit, discharging to Painted Woods-Square Butte, permit term to December 31, 2024
CITY OF MANDAN, Unknown: NDG071058, minor permit, permit term to March 31, 2030
CITY OF MANDAN, Mandan: NDR111825, minor permit, permit term to March 31, 2025
COVE AT LAKEWOOD, Mandan: NDR113860, minor permit, permit term to March 31, 2030

Identity

Facility as filed	MANDAN WTP
Permittee as filed	Mandan WTP
NPDES ID	NDG523493
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	March 15, 2019
Expiration date	March 31, 2024
Issuing agency	North Dakota Department of Environmental Quality
Address	Mandan, ND 58554
Receiving water	Lower Heart
Subwatershed	Rock Haven Creek-Missouri River (HUC 101301011005)

Effluent limits and exceedances

6Pollutants on file
6Under a numeric limit
6With a violation of any kind
0With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measure	Limits	Violations, any kind
Solids, total suspended	3	3
Chlorine, total residual	3	3
pH	2	2
Flow, in conduit or thru treatment plant	2	2
Flow, total	1	1
Duration of discharge	1	1

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES NDG523493.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES NDG523493.

Inspections

EPA’s inspection file holds no inspection for NPDES NDG523493.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES NDG523493.

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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act discharge permit NDG523493 for MANDAN WTP in Mandan, ND, which discharges to Lower Heart and is administratively continued with a Minor discharger class. The facts list 6 pollutants on file, 6 under a numeric limit, 6 with a violation of any kind, and 0 with an effluent exceedance.