01The verdict: is Glen Ullin water safe?
Glen Ullin's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (91.9/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 807 residents using surface water (rivers, lakes, or reservoirs).
1 unresolved violation on record
EPA records show an open compliance item for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓A flood-prone service area
10 federal disaster declarations on record. After severe weather, watch for boil-water advisories.
See the risk factors ↓Glen Ullin's drinking water received a grade of A (91.9 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 807 residents using purchased surface water.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 4 violations on record, including 2 health-based violations. 1 remains unresolved.
Glen Ullin ranks #23 out of 101 cities in North Dakota for water quality, placing it above average in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection. Hexavalent chromium (chromium-6) was detected at 0.38 µg/L in UCMR 3 testing. While below California's 10 µg/L limit and with no federal MCL set, residents sensitive to this contaminant may consider reverse osmosis filtration. As a small community water system, Glen Ullin may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Glen Ullin's water
Every contaminant flagged in Glen Ullin, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in North Dakota
Cities ranked by compounds detected Cu Copper in North Dakota
Cities ranked by 90th-percentile copper
03Glen Ullin's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 4 violations on record, including 2 health-based violations. 1 remains unresolved.
All ten of the last ten years were clean — no EPA violations recorded for Glen Ullin.
▼ Down 5 ppb since 1993. Latest reading: 0 ppb (2024) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Glen Ullin's water comes from
Glen Ullin's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Purchased Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Wholesale supplier
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
1 system
1 water system, operated under local government ownership.
807 people
Residents served across Glen Ullin's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by local government ownership and serves approximately 807 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| GLEN ULLIN CITY OF | ND3000400 | 807 | Purchased Surface Water |
05Pressure on Glen Ullin's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Flood & storm history
10 federal disaster declarations on record for Morton County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Glen Ullin compares
Scores for nearby North Dakota cities on one line, with the average marked.
dashed line = North Dakota average (82/100)
Glen Ullin scores 91.9/100 — above the North Dakota average of 82/100. It outscores 8 of 10 nearby cities. Full North Dakota rankings →
91.5 / 100ABismarck, ND
85.7 / 100BMinot, ND
83.2 / 100AGrand Forks, ND
91.3 / 100ADickinson, ND
93 / 100AWest Fargo, ND
92.2 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Glen Ullin's water — not generic advice.
A basic carbon filter still helps
Glen Ullin's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Glen Ullin alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Glen Ullin, ND tap water safe to drink?
Glen Ullin's water quality earned a grade of A (91.9/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #23 out of 101 cities tested in North Dakota.
What contaminants are in Glen Ullin's water?
Lead was measured at 0.0 ppb (90th percentile). 4 violations are on record.
How is Glen Ullin's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Glen Ullin?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Glen Ullin's water come from?
Glen Ullin's water is sourced from Purchased surface water. The city has 1 water system serving approximately 807 residents.
What health violations has Glen Ullin's water system had?
Glen Ullin has 2 health-based violations on record. The most recent violation was recorded in March 2009. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
How does Glen Ullin's water compare to other cities?
Glen Ullin ranks #23 out of 101 cities in North Dakota (better than 77% of state cities) and #1453 out of 15382 cities nationally (91th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Glen Ullin's small water system affect quality?
Glen Ullin's system serves approximately 807 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 4 violations on record.