01The verdict: is Grand Portage water safe?
Grand Portage's drinking water has significant quality concerns based on EPA testing data. With a grade of F (35/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 820 residents using surface water (rivers, lakes, or reservoirs).
Lead is over its legal limit
Measured at 28.5 ppb against the EPA Action Level of 15 ppb. The ledger below shows how far over — and which filter removes it.
See the measurement ↓820 people, 1 system
All figures on this page come from federal EPA compliance and testing data for the systems serving this city.
See the systems ↓263 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 ↓Grand Portage's drinking water received a grade of F (35 out of 100), indicating failing water quality. The city's 1 water system serves approximately 820 residents using surface water.
Lead levels were measured at 28.5 ppb (90th percentile), which exceeds the EPA action level of 15 ppb. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 513 violations on record, including 23 health-based violations. 57 remain unresolved.
Grand Portage ranks #466 out of 466 cities in Minnesota for water quality, placing it among the lowest-rated 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. Lead levels exceed the EPA action level of 15 ppb, which typically indicates aging lead service lines or lead solder in the distribution system. An NSF 53-certified filter is strongly recommended for drinking and cooking water. As a small community water system, Grand Portage may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 263 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Grand Portage's water
Every contaminant flagged in Grand Portage, 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.
Over Limit — EPA Action Level: 15 ppb
Exceeds the EPA action level. Lead enters at the service line, not the treatment plant — your address matters more than the city average. Lead service line replacement and an NSF 53-certified point-of-use filter are recommended.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. | 28.5 | 15 | ppb | Inorganic | Over Limit |
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
03Grand Portage'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 513 violations on record, including 23 health-based violations. 57 remain unresolved.
1 of the last ten years was clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▲ Up 25 ppb since 2001. The latest reading (29 ppb, 2025) is over the action level. Sampled at higher-risk homes (90th percentile).
04Where Grand Portage's water comes from
Grand Portage's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
1 system
1 water system, operated under native american ownership.
820 people
Residents served across Grand Portage'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 native american ownership and serves approximately 820 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| GRAND PORTAGE | 055294101 | 820 | Surface Water |
Water bodies near Grand Portage
As a surface-water system, these water bodies may directly influence Grand Portage's drinking water supply.
05Pressure on Grand Portage'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
3 federal disaster declarations on record for Cook County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Grand Portage compares
Scores for nearby Minnesota cities on one line, with the average marked.
dashed line = Minnesota average (82/100)
Grand Portage scores 35/100 — below the Minnesota average of 82/100. 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
07What to do at home
Steps matched to what testing actually found in Grand Portage's water — not generic advice.
Filter drinking & cooking water
NSF 53-certified pitcher or under-sink filter. Lead level (28.5 ppb) exceeds the EPA action level of 15 ppb
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Grand Portage 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 Grand Portage, MN tap water safe to drink?
Grand Portage's water quality earned a grade of F (35/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #466 out of 466 cities tested in Minnesota.
What contaminants are in Grand Portage's water?
Lead was measured at 28.5 ppb (90th percentile). 513 violations are on record.
How is Grand Portage'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 Grand Portage?
Yes — lead levels exceed the EPA action level of 15 ppb. We recommend an NSF 53-certified filter or reverse osmosis system. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Grand Portage's water come from?
Grand Portage's water is sourced from Surface water. The city has 1 water system serving approximately 820 residents.
What health violations has Grand Portage's water system had?
Grand Portage has 23 health-based violations on record. The most recent violation was recorded in May 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 57 violations remain unresolved.
How does Grand Portage's water compare to other cities?
Grand Portage ranks #466 out of 466 cities in Minnesota (better than 0% of state cities) and #15195 out of 15382 cities nationally (1th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Grand Portage's small water system affect quality?
Grand Portage's system serves approximately 820 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 513 violations on record.