01The verdict: is Mountain Iron water safe?
Mountain Iron's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (93.8/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 2,880 residents using groundwater (wells).
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 ↓2 violations in the last five years
Recent compliance history is the best predictor of future problems — the year-by-year record is below.
See the record ↓Mountain Iron's drinking water received a grade of A (93.8 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 2,880 residents using groundwater.
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 5 violations on record, including 0 health-based violations. 1 remains unresolved.
Mountain Iron ranks #89 out of 466 cities in Minnesota for water quality, placing it above average in the state. Mountain Iron relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff. As a small community water system, Mountain Iron may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Mountain Iron's water
Every contaminant flagged in Mountain Iron, 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 Minnesota
Cities ranked by compounds detected Cu Copper in Minnesota
Cities ranked by 90th-percentile copper
03Mountain Iron'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 5 violations on record, including 0 health-based violations. 1 remains unresolved.
9 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
0ppb(2023)
One sampling round on record — 0% of the 15ppb EPA action level. Sampled at higher-risk homes (90th percentile).
04Where Mountain Iron's water comes from
Mountain Iron's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
1 system
1 water system (1 wholesaler), operated under local government ownership.
2,880 people
Residents served across Mountain Iron's service area.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals. Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds. The system is operated by local government ownership and serves approximately 2,880 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| Mountain Iron | MN1690035 | 2,880 | Groundwater |
Water bodies near Mountain Iron
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Mountain Iron'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.
Drought
Saint Louis County is in D2 (severe drought) per the U.S. Drought Monitor (week of Jul 2026). Drought can raise disinfection-byproduct levels and taste/odor issues as utilities draw from lower reservoirs.
06How Mountain Iron compares
Scores for nearby Minnesota cities on one line, with the average marked.
dashed line = Minnesota average (82/100)
Mountain Iron scores 93.8/100 — above the Minnesota average of 82/100. It outscores 10 of 10 nearby cities. Full Minnesota rankings →
72.8 / 100BSt. Paul, MN
73.3 / 100CRochester, MN
69.7 / 100ABloomington, MN
93.6 / 100BBrooklyn Park, MN
81.5 / 100ADuluth, MN
88.6 / 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 Mountain Iron's water — not generic advice.
A basic carbon filter still helps
Mountain Iron'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 Mountain Iron alerts
We refresh EPA data monthly and surface new violations, advisories, and boil-water notices for your county on this page.
All water alerts →Frequently asked questions
Is Mountain Iron, MN tap water safe to drink?
Mountain Iron's water quality earned a grade of A (93.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #89 out of 466 cities tested in Minnesota.
What contaminants are in Mountain Iron's water?
Lead was measured at 0.0 ppb (90th percentile). 5 violations are on record.
How is Mountain Iron'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 Mountain Iron?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mountain Iron's water come from?
Mountain Iron's water is sourced from Groundwater. The city has 1 water system serving approximately 2,880 residents.
Is Mountain Iron's groundwater at risk of contamination?
Mountain Iron uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 5 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Mountain Iron's water compare to other cities?
Mountain Iron ranks #89 out of 466 cities in Minnesota (better than 81% of state cities) and #712 out of 15382 cities nationally (95th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mountain Iron's small water system affect quality?
Mountain Iron's system serves approximately 2,880 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 5 violations on record.