Hardness
Unavailable
No qualifying site within 75 miles
Local water dashboard
Official source aggregationWater quality in Caribou, ME 04736
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Aroostook County.
1 reported benchmark flag
- Primary matched system
- Caribou Utilities District
- Source water
- Groundwater
- County
- Aroostook County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0 mg/L
0% of action level
Utility match
5 systems
Serves 3,943 people system-wide
Hardness estimate unavailable
No responsible local estimate yet
We did not find enough qualifying recent USGS hardness observations within 75 miles of this ZIP centroid. We leave the value blank instead of substituting a state average. Ask the serving utility or test the household tap for a property-specific result.
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass1 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2025
Copper (CU90)
2.23 mg/L
Reported Dec 31, 1994
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 2.23
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 8
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | ME0002439 | Archived | Mar 1, 2026through Mar 31, 2026 |
| Revised Total Coliform Rule | ME0002439 | Resolved | Jan 1, 2026through Jan 31, 2026 |
| Revised Total Coliform Rule | ME0002439 | Resolved | Dec 1, 2025through Dec 31, 2025 |
| Revised Total Coliform Rule | ME0002439 | Resolved | Nov 1, 2025through Jan 15, 2025 |
| Revised Total Coliform Rule | ME0002439 | Resolved | Sep 1, 2025through Sep 30, 2025 |
| Consumer Confidence Rule | ME0090320 | Resolved | Jul 1, 2023through May 29, 2024 |
| Diquat | ME0090320 | Resolved | Jan 1, 2021through Dec 31, 2023 |
| Consumer Confidence Rule | ME0002439 | Unaddressed | Oct 1, 2002 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Caribou ZIP 04736 using available compliance data and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile) has a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Caribou
Is tap water safe in Caribou?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
There are not enough qualifying nearby USGS observations for a responsible hardness estimate. Ask the serving utility or test the household tap.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.