Hardness
Moderately Hard
76.1 PPM · 4.5 GPG
Local water dashboard
Official source aggregationWater quality in Presque Isle, ME 04769
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.
2 reported benchmark flags
- Primary matched system
- Presque Isle Utilities District
- Source water
- Groundwater influenced by surface 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 6,128 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
76.1 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
76.1
mg/L as CaCO₃ equivalent
Grains per gallon
4.5
1 GPG ≈ 17.1 PPM
What this means at home
At 76.1 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
1
Nearest site
72.2 mi
Observation range
Jul 11, 2023–Jul 11, 2023
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: ME-WW 1021 (Well).USGS source documentation ↗
Regional context
Is 04769 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Presque Isle median
76 PPM
About the same1 indexed ZIP readings · Range 76.1–76.1 PPM
Maine median
39 PPM
37 PPM higher122 indexed ZIP readings · Range 3.2–94.5 PPM
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 pass2 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2026
Copper (CU90)
3.4 mg/L
Reported Jun 30, 2005
Numerical coverage
3 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 3.4
EPA limit 1.3
CYANIDE
Measured in MG/L
Local 0.3
EPA limit 0.2
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 18
- Health-based
- 2
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | ME0092359 | Resolved | Dec 30, 2025through Mar 18, 2026 |
| CYANIDE | ME0006203 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Consumer Confidence Rule | ME0092175 | Resolved | Jul 1, 2024through Mar 14, 2025 |
| Consumer Confidence Rule | ME0092359 | Unaddressed | Jul 1, 2023 |
| Lead and Copper Rule | ME0092359 | Resolved | Dec 30, 2022through May 11, 2023 |
| Public Notice | ME0006203 | Resolved | Sep 4, 2022through Sep 12, 2022 |
| CYANIDEHealth-basedReported 0.3 MG/L · MCL 0.2 | ME0006203 | Resolved | Jul 1, 2022through Sep 30, 2022 |
| CYANIDEHealth-basedReported 0.245 MG/L · MCL 0.2 | ME0006203 | Resolved | Apr 1, 2022through Jun 30, 2022 |
| TTHM | ME0091310 | Resolved | Oct 1, 2021through Dec 31, 2021 |
| Total Haloacetic Acids (HAA5) | ME0091310 | Resolved | Oct 1, 2021through Dec 31, 2021 |
| Combined Radium (-226 and -228) | ME0006203 | Resolved | Jul 1, 2021through Sep 30, 2021 |
| Revised Total Coliform Rule | ME0006203 | Resolved | Apr 1, 2021through Apr 30, 2021 |
| Revised Total Coliform Rule | ME0006203 | Resolved | Mar 1, 2021through Mar 31, 2021 |
| Combined Uranium | ME0006203 | Resolved | Jan 1, 2021through Mar 31, 2021 |
| Gross Alpha, Excl. Radon and U | ME0006203 | Resolved | Jan 1, 2021through Mar 31, 2021 |
| Lead and Copper Rule | ME0006203 | Resolved | Jan 1, 2021through Jun 21, 2021 |
| Nitrate | ME0006203 | Resolved | Jan 1, 2021through Mar 31, 2021 |
| Combined Radium (-226 and -228) | ME0006203 | Resolved | Jan 1, 2021through Mar 31, 2021 |
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 Presque Isle ZIP 04769 using 76.1 PPM nearby hardness and 3 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile), CYANIDE have 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 Presque Isle
Is tap water safe in Presque Isle?+
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?+
Nearby USGS observations produce an estimate of 76.1 PPM, or 4.5 grains per gallon, classified as moderately hard. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.