Where does the water in 58278 come from?

Water for zip code 58278 in Thompson, North Dakota is provided by 3 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 58278

Thompson, North Dakota · Grand Forks County

220 PPM

12.9 GPG

Hard

0Soft60120180300+

Verified - Annual Water Quality Report

Dataset updated March 9, 2026Matched to 3 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 3 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

1 verified treated-water source

3 matched systems total for this ZIP; treated-water reports are prioritized when available.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 58278

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

3 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Grand Forks Regional Wtp ND1800410	surface water	200 PPM Hard USGS estimate: 564 PPM	57,339	Verified - Annual Water Quality Report
East Central Regional Wd-Gf ND1801062	groundwater	353 PPM Very Hard	5,995	High Confidence - USGS Monitoring
East Central Regional Wd-Traill ND4901071	groundwater	353 PPM Very Hard	2,800	High Confidence - USGS Monitoring

Grand Forks Regional Wtp

ND1800410

Hard

200 PPMsurface water57,339 servedVerified - Annual Water Quality Report

Source water: 564 PPM

East Central Regional Wd-Gf

ND1801062

Very Hard

353 PPMgroundwater5,995 servedHigh Confidence - USGS Monitoring

East Central Regional Wd-Traill

ND4901071

Very Hard

353 PPMgroundwater2,800 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

58201200 58275200 58202200 58203200 58228202 58218250 56721170 56723271 58204200 58223250 56523271 58258200

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

Methodology Data sources How to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Thompson, ND (58278).

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Frequently Asked Questions

Is the water hard in Thompson, ND (58278)?

The average water hardness in 58278 is 220 PPM (12.9 GPG), which is classified as hard.

Do I need a water softener in 58278?

With hardness of 220 PPM, a water softener is recommended for homes in 58278.

Is hard water in 58278 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 58278?

Zip code 58278 in Thompson, North Dakota is served by 3 water systems.