States › Maine › Aroostook County

Aroostook County, ME Water Quality

Water quality data for 23 public water systems serving Aroostook County, Maine — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 23 water systems · 25 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Aroostook County Earns a A

Aroostook County: 25 communities across 23 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.50 ppb
  • 22 communities with a lead detection, 3 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 4 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.5 ppb
Median Lead Level
County-wide, 90th percentile
23
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • New Canada
    1.10 ppb
    No federal limits exceeded on record
    B
  • Crystal
    2.40 ppb
    No federal limits exceeded on record
    B
  • Houlton
    3.40 ppb
    No federal limits exceeded on record
    A
  • Caribou
    Not detected
    No federal limits exceeded on record
    A
  • Madawaska
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Island Falls
    2.70 ppb
    Copper above the 1,300 ppb action level
    C
  • Smyrna
    7.40 ppb
    1 significant inspection deficiency
    B
  • Fort Fairfield
    1.80 ppb
    Copper above the 1,300 ppb action level
    B
  • Mars Hill
    3.40 ppb
    44 health-based violations since 2015
    B
  • Blaine
    3.40 ppb
    44 health-based violations since 2015
    B
County Lead Level — Median 2.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.5 ppb — 16.7% of the federal action level
Systems by Lead Level
Under 5 ppb
19
5 – 10 ppb
2
10 – 15 ppb
1
No Data
3

All Cities in Aroostook County

Presque Isle 1.50 ppb B
Houlton 3.40 ppb A
Caribou Not detected A
Madawaska Not detected B
Fort Kent 1.90 ppb B
Van Buren 2.70 ppb A
Fort Fairfield 1.80 ppb B
Mars Hill 3.40 ppb B
Limestone 2.60 ppb B
Washburn 2.00 ppb B
Ashland 2.30 ppb B
Eagle Lake 4.00 ppb B
Caswell 1.90 ppb B
Mapleton 1.80 ppb B
Island Falls 2.70 ppb C
Grand Isle 2.10 ppb B
Blaine 3.40 ppb B
St. Agatha 11.10 ppb B
Frenchville Not detected B
Easton 3.90 ppb B
Smyrna 7.40 ppb B
Wallagrass 1.10 ppb B
Crystal 2.40 ppb B
New Canada 1.10 ppb B
Weston 5.00 ppb B
Showing 25 cities
No active violations Active violations

About Aroostook County Drinking Water

Aroostook County is served by 23 water systems covering 25 communities. No community here has an open violation on record.

Of the communities reporting lead results, 22 recorded a detection, with a median of 2.50 ppb — 17% of the federal action level. 3 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 4 of them.

Frequently Asked Questions

Is Aroostook County tap water safe to drink?▼
No community in Aroostook County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Aroostook County?▼
Among communities with a detection the median is 2.50 ppb, 17% of the 15 ppb action level. 3 reported none detected and 0 reported no result.
How many water systems serve Aroostook County?▼
23 community water systems serve 25 communities here.
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