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Tap water quality report

Riverdale Subdivision

EPA monitoring tested this supplier for 54 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

54
contaminants tested
7
detected
88
people served
3
health-based violations
North Dakota rankingsLead in North DakotaPFAS in North Dakota
Water source
Ground water
Ownership
Private
Counties served
Cass

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

3
health-based violations
29
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1993-08-01 → 1993-08-31
MCL Health-based Archived 1993-08-01 → 1993-08-31
MCL Health-based Archived 1993-08-01 → 1993-08-31
MR Monitoring Unaddressed 2025-11-24
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
MON Monitoring Resolved 2018-03-01 → 2018-03-31
MON Monitoring Resolved 2018-03-01 → 2018-03-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0070 mg/L 47%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2027
Copper
604 µg/L 46%
of the EPA limit 1300 µg/L
worst single sample: 670 µg/L
12/15 SYR4 2013–2019
Lead
14.442 µg/L 96%
of the EPA limit 15 µg/L
worst single sample: 16.5 µg/L
5/15 SYR4 2013–2019
Arsenic
1.25 µg/L 13%
of the EPA limit 10 µg/L
 1/1 SYR4 2016
Combined Uranium
0.0200 µg/L 0.1%
of the EPA limit 30 µg/L
 1/2 SYR4 2015–2018
Fluoride
252 µg/L 6.3%
of the EPA limit 4000 µg/L
 1/1 SYR4 2018
Selenium
3.66 µg/L 7.3%
of the EPA limit 50 µg/L
 1/1 SYR4 2018
47 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBariumBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDinosebEndrinEthylbenzeneGross Alpha, Excl. Radon And UHeptachlorHeptachlor EpoxideLassoMercuryMethoxychlorNitrate-NitritePentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CARPENTER, ADAM
Phone
701-282-9727
Email
[email protected]

Frequently asked questions about Riverdale Subdivision

Is Riverdale Subdivision tap water safe to drink?

EPA monitoring detected 7 contaminants in Riverdale Subdivision's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Riverdale Subdivision's water?

EPA monitoring detected Lead, Copper, Lead, Arsenic, Combined Uranium, and others. The full list with the level and data source for each is above.

How many people does Riverdale Subdivision serve?

Riverdale Subdivision reports serving 88 people in North Dakota, per its EPA record.

Has Riverdale Subdivision had any water quality violations?

The EPA has 29 violations on file for Riverdale Subdivision, of which 3 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.