ZipCheckup grade for 58634: C.
A mixed picture - some signals here are worth your attention.
Your top priority: test this home for radon. Check your ZIP → EPA radon map
Grassy Butte, ND (58634): High Radon Potential Area - 67/100
EPA data for Mckenzie County Wrd
EPA records for the water systems mapped to 58634 in Grassy Butte, ND contain zero recorded violations for inclusive record years 2021 through 2026. This does not establish that every category was monitored or published, and it does not cover events outside that source window.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water No drinking-water violations in EPA records since 2021.
- Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
- Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.
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Score Breakdown
Overall Home Safety Score: 67/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (5) HIGH
Your Water System
ZIP code 58634 in Grassy Butte, North Dakota is mapped to the water system Mckenzie County Wrd (EPA ID: ND2701477). This system provides water to approximately 3,895 people from surface water sources.
Other Water Quality Reports in North Dakota
- 58001 (Abercrombie)
- 58002 (Absaraka)
- 58004 (Amenia)
- 58005 (Argusville)
- 58006 (Arthur)
- 58007 (Ayr)
- 58008 (Barney)
- 58009 (Blanchard)
- 58011 (Buffalo)
- 58012 (Casselton)
- 58013 (Cayuga)
- 58015 (Christine)
- 58016 (Clifford)
- 58017 (Cogswell) - 1 violation recorded for mapped water systems
- 58018 (Colfax)
- 58021 (Davenport)
- 58027 (Enderlin) - 1 violation recorded for mapped water systems
- 58029 (Erie)
- 58030 (Fairmount)
- 58031 (Fingal)
Nearby Water Quality Reports
- 58627 (Fairfield) - 15 mi
- 58640 (Killdeer) - 24 mi
- 58854 (Watford City) - 25 mi - 1 violation recorded for mapped water systems
- 58835 (Arnegard) - 26 mi
- 58831 (Alexander) - 30 mi
- 58626 (Dunn Center) - 32 mi
- 58757 (Mandaree) - 35 mi
- 58642 (Manning) - 36 mi
- 58645 (Medora) - 37 mi
- 58847 (Keene) - 39 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Mckenzie County Wrd (ND2701477) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
Environmental Hazards (10) MODERATE
Home & Infrastructure (5) OK
Cost & Community (6) OK
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Frequently Asked Questions
Is the tap water in 58634 safe to drink?
EPA SDWIS records 0 violations since 2021 across the water systems mapped to ZIP 58634 (primary system: Mckenzie County Wrd), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 58634's water come from?
The recorded water source for Mckenzie County Wrd, a system mapped to ZIP code 58634, is Surface water. This system serves approximately 3,895 people.
How does Grassy Butte water compare to the national average?
Grassy Butte's Home Safety Score ranks lower than 65% of U.S. ZIP codes, and lower than 73% of ZIP codes within North Dakota.
How can I get my water tested in Grassy Butte?
If Mckenzie County Wrd supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
What is the radon risk for 58634?
58634 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in McKenzie County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
How to cite this page
ZipCheckup. (2026). Grassy Butte, ND (58634): High Radon Potential Area - 67/100. https://zipcheckup.com/report/58634/
@misc{zipcheckup-report-58634,
author = {{ZipCheckup}},
title = {{Grassy Butte, ND (58634): High Radon Potential Area - 67/100}},
year = {2026},
url = {https://zipcheckup.com/report/58634/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 58634
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 58627 | Fairfield, ND | 14.5 mi | N/A | 0 |
| 58640 | Killdeer, ND | 24.3 mi | N/A | 0 |
| 58854 | Watford City, ND | 25.0 mi | C | 1 |
| 58835 | Arnegard, ND | 26.3 mi | N/A | 0 |
| 58831 | Alexander, ND | 29.5 mi | N/A | 0 |
| 58626 | Dunn Center, ND | 32.1 mi | N/A | 0 |
| 58757 | Mandaree, ND | 34.9 mi | N/A | 0 |
| 58642 | Manning, ND | 36.2 mi | N/A | 0 |
| 58645 | Medora, ND | 37.1 mi | N/A | 0 |
| 58847 | Keene, ND | 39.2 mi | N/A | 0 |
Nearby ZIP Code Reports
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Overall safety breakdown
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