01The verdict: is Mars Hill water safe?
Mars Hill's drinking water has significant quality concerns based on EPA testing data. With a grade of D+ (50/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,500 residents using groundwater (wells).
4 unresolved violations on record
EPA records show open compliance items 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 3.4 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓53 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 ↓Mars Hill's drinking water received a grade of D+ (50 out of 100), indicating poor water quality. The city's 1 water system serves approximately 1,500 residents using groundwater.
Lead levels were measured at 3.4 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 113 violations on record, including 58 health-based violations. 4 remain unresolved.
Mars Hill ranks #152 out of 156 cities in Maine for water quality, placing it among the lowest-rated in the state. Mars Hill 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, Mars Hill may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities. The system has seen 53 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Mars Hill's water
Every contaminant flagged in Mars Hill, 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. | 3.4 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Maine
Cities ranked by compounds detected Cu Copper in Maine
Cities ranked by 90th-percentile copper
03Mars Hill'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 113 violations on record, including 58 health-based violations. 4 remain unresolved.
2 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.
▼ Down 13 ppb since 1993. Latest reading: 3.4 ppb (2025) — 23% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Mars Hill's water comes from
Mars Hill'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, operated under local government ownership.
1,500 people
Residents served across Mars Hill'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 1,500 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| MARS HILL AND BLAINE WATER COMPANY | ME0090940 | 1,500 | Groundwater |
Water bodies near Mars Hill
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Mars Hill'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.
Industrial discharge
1 facility within 10 miles reported 1,650k lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
Flood & storm history
8 federal disaster declarations on record for Aroostook County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Mars Hill compares
Scores for nearby Maine cities on one line, with the average marked.
dashed line = Maine average (85/100)
Mars Hill scores 50/100 — below the Maine average of 85/100. Full Maine rankings →
93.8 / 100ACumberland, ME
93.8 / 100AFalmouth, ME
92.8 / 100APortland, ME
93.2 / 100CRaymond, ME
55.9 / 100CScarborough, ME
63.8 / 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 Mars Hill's water — not generic advice.
A basic carbon filter still helps
Mars Hill'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 →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 Mars Hill 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 Mars Hill, ME tap water safe to drink?
Mars Hill's water quality earned a grade of D+ (50/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #152 out of 156 cities tested in Maine.
What contaminants are in Mars Hill's water?
Lead was measured at 3.4 ppb (90th percentile). 113 violations are on record.
How is Mars Hill'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 Mars Hill?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mars Hill's water come from?
Mars Hill's water is sourced from Groundwater. The city has 1 water system serving approximately 1,500 residents.
What health violations has Mars Hill's water system had?
Mars Hill has 58 health-based violations on record. The most recent violation was recorded in January 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 4 violations remain unresolved.
Is Mars Hill's groundwater at risk of contamination?
Mars Hill 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 113 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 Mars Hill's water compare to other cities?
Mars Hill ranks #152 out of 156 cities in Maine (better than 3% of state cities) and #12892 out of 15382 cities nationally (16th percentile). The grade of D+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mars Hill's small water system affect quality?
Mars Hill's system serves approximately 1,500 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 113 violations on record.