Hardness
Moderately Hard
64.1 PPM · 3.7 GPG
Local water dashboard
Official source aggregationWater quality in Hopkinton, RI 02833
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Washington County.
2 active health-based violations
- Primary matched system
- Lindhbrook Water Company
- Source water
- Groundwater
- County
- Washington County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
2 active health-based records
Lead 90th percentile
0.004 mg/L
27% of action level
Utility match
5 systems
Serves 200 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
64.1 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
64.1
mg/L as CaCO₃ equivalent
Grains per gallon
3.7
1 GPG ≈ 17.1 PPM
What this means at home
At 64.1 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
241
Nearest site
5.9 mi
Observation range
May 11, 2016–Dec 2, 2025
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: CT- GS 95 (Well).USGS source documentation ↗
Regional context
Is 02833 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Hopkinton median
64 PPM
About the same1 indexed ZIP readings · Range 64.1–64.1 PPM
Rhode Island median
43 PPM
21 PPM higher33 indexed ZIP readings · Range 40.5–64.1 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 pass1 fail
Lead (PB90)
0.004 mg/L
Reported Dec 31, 2024
Copper (CU90)
1.54 mg/L
Reported Dec 31, 2025
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.004
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.54
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 188
- Health-based
- 5
- Active health-based
- 2
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | RI1000045 | Unaddressed | Jan 1, 2026 |
| Lead and Copper Rule | RI1000045 | Unaddressed | Sep 29, 2025 |
| Consumer Confidence Rule | RI1000045 | Resolved | Jul 1, 2025through Jul 2, 2025 |
| Consumer Confidence Rule | RI2980473 | Resolved | Jul 1, 2025through Aug 7, 2025 |
| Revised Total Coliform Rule | RI1000098 | Archived | Jan 1, 2025through Mar 31, 2025 |
| Lead and Copper Rule | RI1000045 | Resolved | Jan 1, 2025through Feb 4, 2025 |
| Revised Total Coliform Rule | RI1000045 | Resolved | Jan 1, 2025through Mar 31, 2025 |
| Lead and Copper RuleHealth-based | RI1000098 | Unaddressed | Nov 18, 2024 |
| Lead and Copper Rule | RI1000045 | Addressed | Oct 1, 2024 |
| Lead and Copper Rule | RI1000098 | Unaddressed | Sep 28, 2024 |
| E. COLI | RI1000098 | Resolved | Aug 23, 2024through Aug 22, 2024 |
| Consumer Confidence Rule | RI2980423 | Resolved | Jul 1, 2024through Jul 9, 2024 |
| Groundwater RuleHealth-based | RI1000098 | Unaddressed | Apr 16, 2024 |
| Revised Total Coliform Rule | RI1000098 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Lead and Copper Rule | RI1000098 | Unaddressed | Mar 30, 2024 |
| 1,2,4-Trichlorobenzene | RI1000045 | Resolved | Jan 1, 2024through Dec 31, 2024 |
| Xylenes, Total | RI1000045 | Resolved | Jan 1, 2024through Dec 31, 2024 |
| o-Dichlorobenzene | RI1000045 | Resolved | Jan 1, 2024through Dec 31, 2024 |
| p-Dichlorobenzene | RI1000045 | Resolved | Jan 1, 2024through Dec 31, 2024 |
| Vinyl chloride | RI1000045 | Resolved | Jan 1, 2024through Dec 31, 2024 |
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 Hopkinton ZIP 02833 using 64.1 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile), Lead and Copper Rule, Groundwater Rule 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 Hopkinton
Is tap water safe in Hopkinton?+
EPA ECHO reports 2 active health-based violations among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 64.1 PPM, or 3.7 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.