Is Bismarck tap water safe to drink?

Yes but with caveats

Bismarck's water meets EPA minimum standards but has some concerns. Filtration is recommended for sensitive individuals.

78/100

Purity Score

Issues Found

8.8 GPG

Hardness

Not detected

PFAS

3 Issues Detected in Bismarck

Moderately Hard Water (8.8 GPG)

Hardness above 7 GPG can cause minor scale buildup.

Hardness data for Bismarck

Moderate Chlorine Level

Chlorine within EPA limits but may affect taste.

Chlorine info for Bismarck

Arsenic Approaching Limit (0.2 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Bismarck

Fix Your Water — See Recommended Filters

North Dakota

585,015,850,258,503 · Missouri River

Bismarck Tap Water Report: Safety and Contaminants

Moderate Risk Updated March 2026 73,622 residents

See Best Filters for Bismarck

Purity Score

Mineral content in Bismarck's water supply rates as moderately hard. This guide covers what that means for your home and which filters or softeners address it best.

Water Quality Data

Hard water in Bismarck

Chlorine

Medium

Affects taste and skin. Carbon filter removes it.

Learn about chlorine

TDS

Unknown

High TDS (>500 ppm) may affect taste.

Contaminant Levels

PFAS

Lead

2 ppb

Nitrate

1.2 mg/L

Arsenic

0.2 mg/L

Hardness

8.8 gpg

Health Insights

1
At 8.8 GPG, Bismarck's water qualifies as moderately hard. This can cause limescale in pipes and shorten appliance lifespan.
2
Chlorine levels may affect the taste of Bismarck's tap water. A carbon filter improves flavor.

Score

78 /100

Good

"Good" threshold (70)

Bismarck tap water is sourced from Missouri River and treated by Bismarck Public Works. Water hardness is hard at 8.8 GPG which may cause scale buildup. Overall purity score: 78/100 (Good). Updated for 2026.

Fix Your Water

Best filters matched to Bismarck's 3 issues.

See Filters

MATCHED TO BISMARCK'S WATER DATA

Best Water Filters for Bismarck, ND (2026)

Matched to Hard Water (8.8 GPG), Moderate Chlorine in Bismarck.

Hard Water (8.8 GPG) Moderate Chlorine

Best Overall #1 for Bismarck

AFWFilters 5600sxt 48000 Grain Softener

Salt-Based Water Softener

$650-750

Why this fits Bismarck

Handles Bismarck's hard water (Hard Water (8.8 GPG))
Premium quality at $650-750

Pros & Cons +

48000 grain capacity handles very hard water

Digital metered valve saves salt

Requires salt refills monthly

Does not remove contaminants

Fix Your Water — Check Price

Best Value

Clearly Filtered Water Pitcher

Pitcher Filter

$80-95

Why this fits Bismarck

Eliminates chlorine taste and odor from Bismarck's water
NSF/ANSI 42 + NSF/ANSI 53 + NSF/ANSI 401 certified
Budget-friendly at $80-95

Pros & Cons +

No installation fill and pour

Removes 365+ contaminants including PFAS

Small capacity 2-3 people

Filter replacements every 4 months

Check Price on Amazon

Best for Taste

Waterdrop 10UA Under-Sink Filter

Under-Sink Carbon Filter

$40-60

Why this fits Bismarck

Eliminates chlorine taste and odor from Bismarck's water
NSF/ANSI 42 certified
Budget-friendly at $40-60

Pros & Cons +

Very affordable

Easy DIY install no plumber

Does not remove PFAS or hardness

Single point of use only

Check Price on Amazon

Also Recommended

Waterdrop G3P800 Tankless RO

Tankless Reverse Osmosis

$380-450

Why this fits Bismarck

Eliminates chlorine taste and odor from Bismarck's water
NSF/ANSI 58 + NSF 372 certified
Premium quality at $380-450

Pros & Cons +

No tank saves cabinet space

800 GPD fast flow rate

Higher upfront cost

Filter replacements are proprietary

Check Price on Amazon

As an Amazon Associate, PurityMap may earn from qualifying purchases. Based on latest Bismarck water data.

Full Filter Comparison for Bismarck

Know exactly what's in YOUR tap

City data shows averages. Your home may differ.

Test Your Water — $25-30

About Bismarck's Water

Hard Water in Bismarck: Impact on Plumbing and Appliances

At 8.8 grains per gallon, Bismarck's water qualifies as hard. Hard water carries dissolved calcium and magnesium that deposit as limescale inside pipes, water heaters, dishwashers, and washing machines over time. Scale accumulation reduces appliance efficiency and shortens service life. A salt-based water softener is the most effective solution for whole-home protection. For drinking water only, a reverse osmosis system also reduces mineral content significantly.

Explore Bismarck Water Data

Bismarck Water FAQ

Is Bismarck ND tap water safe to drink in 2026?

Bismarck tap water meets EPA federal drinking water standards and scores 78/100 (Good) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.

Does Bismarck ND use chlorine or chloramine for disinfection?

Bismarck uses chloramine as the primary disinfectant with a residual level of 1.3 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.

How hard is Bismarck ND water and what is the TDS level?

Bismarck water hardness is 8.8 grains per gallon (hard) with a TDS of 310 ppm (poor). This level causes noticeable scale buildup in water heaters kettles and dishwashers. A water softener is recommended to protect plumbing and reduce soap usage.

Has PFAS been found in Bismarck ND drinking water?

Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Bismarck drinking water.

What is the best water filter for Bismarck?

Based on Bismarck's water profile, we recommend the AFWFilters 5600sxt 48000 Grain Softener. Bismarck has elevated chlorine residuals. An under-sink carbon filter removes chlorine and disinfection byproducts at the tap.

Nearby Reports

FargoNorth Dakota — 75/100 MinotNorth Dakota — 75/100 Grand ForksNorth Dakota — 78/100

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Data Sources

EPA SDWIS
EWG Tap Water Database
Bismarck Public Works CCR
USGS monitoring data

PurityMap compiles public data. Updated March 2026.

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