ZIP Code 58278 Water Quality & Testing Report
Thompson, ND · Grand Forks County County · Updated for 2026
Is Tap Water Safe to Drink in ZIP 58278 (Thompson, ND)?
Caution / Filtration Recommended: Tap water in ZIP code 58278 (Thompson, ND) has compliance concerns, earning an EPA Safety Grade of C (61/100) due to 0 health violation(s) and 1.1 ppb lead. While treated by East Central Regional Water District-gf, residents are advised to use an NSF/ANSI 53 certified water filter for drinking and cooking.
Water Safety Grade
Fair — Some compliance concerns
Health Violations
0
Total Violations
2
Lead Risk
Moderate
Contaminants
0
About Tap Water in ZIP Code 58278
Tap water in ZIP code 58278 (Thompson, ND) is distributed by East Central Regional Water District-gf (EPA ID: ND1801062), serving approximately 5,995 residents. Based on EPA Safe Drinking Water Act compliance records, this system receives a water safety grade of C with a composite quality score of 61/100.
Water System
East Central Regional Water District-gf
EPA ID: ND1801062
Water Source
Ground Water
Population Served
5,995 residents
County
Grand Forks County County, North Dakota
Lead Levels in ZIP 58278
EPA action level: 15 ppb | Public health goal: 0 ppb
Lead Level: 1.1 ppb — Very Low
Lead exposure risk in 58278 is rated Moderate. EPA models estimate a 43% exposure probability based on housing and infrastructure age.
EPA model estimate based on housing age and infrastructure
Water Hardness & Mineral Content
Grains per gallon (GPG) & Parts per million (PPM / mg/L)
Water in ZIP 58278 is Very Hard (236 mg/L / 13.8 GPG). High concentrations of dissolved limestone minerals cause severe mineral buildup, stiff laundry, dry skin, and premature water heater wear.
Grains per gallon
Parts per million CaCO3
Official EPA SDWIS Database Entry
Utility: East Central Regional Water District-gf · PWSID: ND1801062
Violation History
Past 5 years — EPA SDWIS data
East Central Regional Water District-gf has recorded 2 violations, but none are health-based (e.g., administrative or monitoring infractions). 2 violations remain unresolved in EPA tracking records.
Regulatory compliance risk for this utility is rated High based on past reporting and enforcement records.
Contaminants Detected
Contaminants with health-based violations on record
No health-based contaminant violations are on record for ZIP code 58278 under the Safe Drinking Water Act.
⚖ Enforcement Actions
Water Source & Environmental Factors
Ground Water
This system draws water from underground aquifers. Groundwater is naturally filtered through soil and rock, but can still contain naturally occurring minerals like arsenic, radium, or nitrates.
Highest potential
Estimated annual flood-related costs per property
% of household income spent on energy — indicator of older infrastructure
EPA Radon Zone 1 — highest potential for radon in indoor air. Homeowners should test their home for radon and consider mitigation if levels exceed 4 pCi/L.
Water Quality Testing in ZIP 58278
Tap Water & Well Testing Recommendations
Residents in ZIP code 58278 served by East Central Regional Water District-gf can test tap water or private well systems to verify water purity. Testing detects hidden contaminants before they impact family health.
Tap Water Testing Steps
- 1.Conduct a certified lead check if your home was constructed before 1986.
- 2.Use certified lab testing kits rather than uncalibrated test strips for regulated compliance.
- 3.Sample water from both your kitchen faucet and water heater to compare line purity.
Private Well Testing Steps
- •Test for Coliform bacteria and Nitrates annually.
- •Test for heavy metals, radon, and PFAS every 3 years.
- •Send samples to a state-certified drinking water laboratory recognized by North Dakota Department of Environmental Quality.
🛡 What Should You Do? — ZIP 58278 Recommendations
Some compliance concerns — take precautions
- ⚠ Use a certified NSF/ANSI 53 filter for drinking and cooking water if you have young children
- ⚠ Never give unfiltered tap water to infants in formula — use certified bottled or filtered water
- ⚠ Request a copy of the Consumer Confidence Report to see what was detected and when
- ⚠ Call the EPA Safe Drinking Water Hotline: 1-800-426-4791
Recommended Water Treatment Systems:
NSF 53 Lead Pitcher Filter
Specifically certified to reduce lead and copper at the tap.
NSF 58 Under-Sink RO System
Advanced filtration for PFAS, fluoride, nitrates, and organic chemicals.
Frequently Asked Questions — ZIP 58278 Water Quality
Is tap water safe to drink in ZIP code 58278?+
How do I get my water tested in ZIP 58278 (Thompson, ND)?+
How hard is the tap water in 58278?+
Should I test private well water in 58278?+
What is the lead level in 58278 tap water?+
Is there an active boil water notice in 58278?+
Who provides tap water to 58278?+
What water filter should I use in 58278?+
Data Sources & Methodology
Water quality data for ZIP code 58278 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by East Central Regional Water District-gf. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →