Is Minot, ND Tap Water Safe to Drink?
Minot tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: lead at 13.5 ppb (above the upcoming 10 ppb standard, effective 2027). A point-of-use filter is recommended for drinking and cooking water. Minot also has very hard water at 280 PPM.
Hardness Scale: Where Minot Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Minot Compares
Minot's water is 103% harder than the national average of 138 PPM. It ranks #87 out of 1000 cities in our database (harder than 91% of US cities we track). Within North Dakota, Minot has the 3rd hardest water out of 6 cities - 4% above the state average of 270 PPM. Among smaller cities, Minot ranks #30 of 288 for hardness. At this hardness level, water heaters run an estimated 51% less efficiently due to scale insulation, and major water-using appliances typically last 4 years less than the national average lifespan.
What Minot's Water Means for Your Home
Hardness: 280 PPM - Treatment Recommended
Minot has some extremely hard water. At 280 PPM (16.4 grains per gallon), your tap is loaded with dissolved calcium and magnesium picked up from underground limestone and dolomite formations. Here's the thing: it's perfectly safe to drink. The minerals won't hurt you. But they will hurt your wallet. That adds up. Hard water at 280 PPM increases household costs through scale-coated water heaters that use more energy, extra soap and detergent, and appliances that wear out faster. Most Minot homeowners don't realize it until the plumber shows up. That's 4% harder than the North Dakota average.
Contaminants & Safety
Lead is the main concern here. At 13.5 ppb, Minot's average is well above the health guideline of zero — there is no safe level of lead, especially for children. Lead typically enters your water from old pipes, not the source itself. Quick fix: run cold water for 30 seconds before drinking. Better fix: a certified lead-reduction filter (NSF/ANSI Standard 53) at your kitchen faucet. If your home was built before 1986, testing is strongly recommended.
What's in the Treatment Process
Even though Minot draws from groundwater, the treatment process still generates disinfection byproducts: TTHMs at 51.3 ppb and HAA5 at 13.9 ppb. Groundwater typically needs less treatment than surface water, but when organic compounds are present in the aquifer, chlorination creates the same byproducts. All levels are within legal limits, though above the stricter EWG health guidelines.
Chromium-6 is naturally present in Minot's aquifer geology at 1.4 ppb — 70x the EWG health guideline. There's no federal legal limit for chromium-6 specifically (only total chromium), which is why EWG tracks it separately. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
How Hard Water Affects Your Home
At 280 PPM, untreated hard water has measurable effects on household costs and appliance life:
- Water heater inefficiency: Scale insulation forces the heater to work harder (DOE estimates up to 22% more energy for heavily scaled units)
- Soap and detergent: Hard water reduces lathering, requiring significantly more product
- Appliance replacement: Water heaters, dishwashers, and washing machines fail 2-4 years earlier due to scale buildup
- Plumbing maintenance: Scale buildup in pipes reduces flow and requires more frequent service
Note: Impact varies by household size, water usage, and local energy costs. A home water test provides the most accurate assessment for your specific situation.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 280 PPM | < 60 PPM | No federal limit | ⚠ Very Hard |
| Total Dissolved Solids | 404 PPM | < 300 PPM | 500 PPM | ⚠ Elevated |
| PFAS (total) | 0 ppt | — | No total limit | ✓ ND |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 13.5 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ⚠ Elevated |
| Chlorine / Chloramine | 1 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.085 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Minot Homes
Our Top Picks for Minot (280 PPM)
Hard water at 280 PPM causes scale buildup, increased energy use, and premature appliance failure. A softener protects your plumbing and appliances.
Recommended Filter for Minot
Lead at 13.5 ppb exceeds the upcoming 10 ppb action level (effective 2027). A certified filter reduces these contaminants effectively.
Quick Fix for Chlorine: Shower Filter
At 1 mg/L chlorine, many Minot residents notice dry skin, brittle hair, and that "pool smell" in the shower. A shower filter installs in 5 minutes, no tools needed.
How to Test Your Water in Minot
Lead enters water from your home's plumbing, not the treatment plant — so Minot's city-wide average of 13.5 ppb may not match your tap. Testing your specific faucet is the only way to know. Run cold water for 30 seconds before collecting a sample.
Free option: Request City of Minot Water's annual Consumer Confidence Report for official city-level data.
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About Minot's Water Supply
Water Utility: City of Minot Water
Water Source: Souris River & wells (Groundwater)
Population Served: 48,743
Hardness: 280 PPM (16.4 grains per gallon)
Minot draws its drinking water from groundwater sources — Souris River & wells. Groundwater typically requires less treatment than surface water because the earth acts as a natural filter. The tradeoff: dissolved minerals from underground rock formations, which is why hardness is elevated here. Calcium and magnesium dissolve into the water as it moves through limestone and dolomite. The system serves 49,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Minot Water's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by City of Minot Water in Minot, ND, including ZIP codes:
58310, 58313, 58316, 58317, 58318, 58324, 58325, 58329, 58331, 58332, 58339, 58343, 58346, 58348, 58351, 58353, 58363, 58365, 58366, 58367, 58368, 58369, 58384, 58385, 58386, 58531, 58540, 58565, 58701, 58702, 58703, 58704, 58705, 58707, 58710, 58711, 58712, 58713, 58716, 58718, 58721, 58722, 58723, 58725, 58727, 58730, 58731, 58733, 58734, 58735, 58736, 58737, 58740, 58741, 58744, 58746, 58748, 58750, 58752, 58755, 58756, 58758, 58759, 58760, 58761, 58762, 58763, 58765, 58768, 58769, 58770, 58771, 58772, 58773, 58775, 58776, 58778, 58779, 58781, 58782, 58783, 58784, 58785, 58787, 58788, 58789, 58790, 58792, 58793, 58794, 58795, 58830, 58833, 58843, 58844, 58845, 58847, 58849, 58852, 58856, 59211, 59219, 59252, 59254, 59256, 59275
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Water Softener Sizing for Minot
At 280 PPM (16.4 GPG), here is how to size a softener for your Minot home. Multiply hardness in GPG (16.4) by daily water usage (roughly 50 gallons per person). A family of four uses about 200 gallons/day: 16.4 GPG × 200 gal = 3280 grains/day. Over a 7-day regeneration cycle, that is 22,960 grains - a 32,000-grain softener is the right fit for most Minot households.
Compare Minot to Other North Dakota Cities
Frequently Asked Questions About Minot Water
Is Minot tap water safe to drink?
Where does Minot's water come from?
Do I need a water softener in Minot?
What water filter is best for Minot?
Does Minot water damage tankless water heaters?
Do I need both a softener AND a filter in Minot?
How much does hard water cost a Minot household per year?
What is the hardness of Minot water in grains per gallon?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Minot Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 280 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Minot's water data.