Is Bismarck, ND Tap Water Safe to Drink?
Yes, Bismarck tap water is safe to drink. No contaminants exceed health guidelines. However, Bismarck has very hard water at 299 PPM, which will cause scale buildup in plumbing and appliances over time. A water softener is worth considering.
Hardness Scale: Where Bismarck Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Bismarck Compares
Bismarck's water is 117% harder than the national average of 138 PPM. It ranks #41 out of 1000 cities in our database (harder than 96% of US cities we track). Within North Dakota, Bismarck has the 2nd hardest water out of 6 cities - 11% above the state average of 270 PPM. Among cities (50k-100k), Bismarck ranks #11 of 258 for hardness. At this hardness level, water heaters run an estimated 55% less efficiently due to scale insulation, and major water-using appliances typically last 4 years less than the national average lifespan.
What Bismarck's Water Means for Your Home
Hardness: 299 PPM - Treatment Recommended
Bismarck has some extremely hard water. At 299 PPM (17.5 grains per gallon), your tap is loaded with mineral content carried in from the watershed geology. 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 299 PPM increases household costs through scale-coated water heaters that use more energy, extra soap and detergent, and appliances that wear out faster. Most Bismarck homeowners don't realize it until the plumber shows up. That's 11% harder than the North Dakota average.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Bismarck's water has TTHMs at 29.8 ppb and HAA5 at 10.1 ppb — both within legal limits, but the EWG health guidelines are far stricter. These byproducts form when chlorine reacts with organic matter during treatment. A whole-house activated carbon filter reduces both chlorine and its byproducts. Want the full picture? Request your utility's annual Consumer Confidence Report.
What's in the Treatment Process
Bismarck's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 29.8 ppb (37% of the legal limit, but 199x the EWG guideline) and HAA5 at 10.1 ppb (17% of the legal limit, but 101x the EWG guideline). These are within legal limits, but the EWG sets much tighter thresholds based on cancer-risk research. A whole-house activated carbon filter reduces both chlorine and byproducts.
Chromium-6 was detected at 0.563 ppb, which is 28x the EWG health guideline. There's no separate federal limit for chromium-6, only total chromium. A reverse osmosis system is the most effective removal method. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
How Hard Water Affects Your Home
At 299 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) | 299 PPM | < 60 PPM | No federal limit | ⚠ Very Hard |
| Total Dissolved Solids | 374 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 | 2.8 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 0.8 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.0213 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Our Top Picks for Bismarck (299 PPM)
Hard water at 299 PPM causes scale buildup, increased energy use, and premature appliance failure. A softener protects your plumbing and appliances.
How to Test Your Water in Bismarck
With 299 PPM hardness, a quick test strip confirms whether your specific tap matches Bismarck's average before you invest in a softener. Hardness can vary within the same system.
Free option: Request City of Bismarck Water's annual Consumer Confidence Report for official city-level data.
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About Bismarck's Water Supply
Water Utility: City of Bismarck Water
Water Source: Missouri River (Surface Water)
Population Served: 72,417
Hardness: 299 PPM (17.5 grains per gallon)
Bismarck's drinking water comes from surface sources — Missouri River. Surface water requires more extensive treatment than groundwater, including coagulation, filtration, and disinfection. This heavier chlorination is why disinfection byproducts tend to be higher in surface-supplied systems. Despite the treatment process, mineral hardness from the watershed carries through. The system serves 72,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Bismarck 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 Bismarck Water in Bismarck, ND, including ZIP codes:
57601, 57621, 57630, 57632, 57633, 57639, 57641, 57642, 57645, 57648, 57656, 57657, 57658, 57659, 57660, 57661, 58341, 58402, 58418, 58420, 58422, 58423, 58424, 58428, 58430, 58438, 58442, 58444, 58451, 58463, 58467, 58475, 58476, 58477, 58478, 58482, 58483, 58486, 58487, 58488, 58494, 58495, 58496, 58501, 58502, 58503, 58504, 58505, 58506, 58507, 58520, 58521, 58524, 58528, 58529, 58530, 58532, 58533, 58535, 58538, 58542, 58544, 58545, 58549, 58552, 58554, 58558, 58559, 58560, 58561, 58563, 58564, 58566, 58568, 58569, 58570, 58571, 58572, 58573, 58575, 58576, 58577, 58579
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Water Softener Sizing for Bismarck
At 299 PPM (17.5 GPG), here is how to size a softener for your Bismarck home. Multiply hardness in GPG (17.5) by daily water usage (roughly 50 gallons per person). A family of four uses about 200 gallons/day: 17.5 GPG × 200 gal = 3500 grains/day. Over a 7-day regeneration cycle, that is 24,500 grains - a 32,000-grain softener is the right fit for most Bismarck households.
Compare Bismarck to Other North Dakota Cities
Frequently Asked Questions About Bismarck Water
Is Bismarck tap water safe to drink?
Where does Bismarck's water come from?
Do I need a water softener in Bismarck?
Does Bismarck water damage tankless water heaters?
How much does hard water cost a Bismarck household per year?
What is the hardness of Bismarck water in grains per gallon?
What size water softener do I need for Bismarck?
Salt-based softener or salt-free conditioner for Bismarck?
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 Bismarck Homeowners Actually Buy
Common purchases for homes with 299 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Bismarck's water data.