Hardness
Moderately Hard
75.9 PPM · 4.4 GPG
Local water dashboard
Official source aggregationA source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Middlesex County.
At a glance
EPA quarter 2026Q2
Hardness
Moderately Hard
75.9 PPM · 4.4 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
5.0e-4 mg/L
3% of action level
Utility match
9 systems
Serves 500 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
75.9 PPM
Parts per million
75.9
mg/L as CaCO₃ equivalent
Grains per gallon
4.4
1 GPG ≈ 17.1 PPM
What this means at home
At 75.9 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
147
Nearest site
5 mi
Observation range
Jan 13, 2016–Sep 25, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: MA-LWW 171 LITTLETON, MA (Well).USGS source documentation ↗
Regional context
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Boxborough median
76 PPM
About the same1 indexed ZIP readings · Range 75.9–75.9 PPM
Massachusetts median
49 PPM
27 PPM higher328 indexed ZIP readings · Range 24.3–128 PPM
EPA benchmark screen
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
Lead (PB90)
5.0e-4 mg/L
Reported Dec 31, 2027
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Measured in mg/L
Local 5.0e-4
EPA limit 0.015
100% line = listed limit
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | MA2037006 | Resolved | Oct 1, 2024through Jul 16, 2025 |
| Consumer Confidence Rule | MA2037038 | Addressed | Jul 1, 2024 |
| Lead and Copper Rule | MA2037036 | Resolved | Sep 29, 2022through Jul 11, 2023 |
| Lead and Copper Rule | MA2037036 | Resolved | Jul 1, 2022through Jun 26, 2023 |
| Consumer Confidence Rule | MA2037036 | Resolved | Jul 1, 2022through Aug 15, 2022 |
| Consumer Confidence Rule | MA2037002 | Addressed | Jul 1, 2022 |
| Lead and Copper Rule | MA2037036 | Resolved | Apr 1, 2022through Jul 13, 2022 |
| Lead and Copper Rule | MA2037036 | Resolved | Jan 1, 2022through Jun 26, 2023 |
| Revised Total Coliform RuleHealth-based | MA2037002 | Resolved | Dec 1, 2021through Dec 23, 2021 |
| Chlorine | MA2037036 | Archived | Oct 1, 2021through Dec 31, 2021 |
| Lead and Copper Rule | MA2037036 | Resolved | Sep 29, 2021through Jul 13, 2022 |
| Lead and Copper Rule | MA2037007 | Resolved | Jun 1, 2021through Sep 21, 2022 |
| Radium-228 | MA2037013 | Resolved | Apr 1, 2021through Jun 30, 2021 |
| Radium-226 | MA2037013 | Resolved | Apr 1, 2021through Jun 30, 2021 |
| Nitrate | MA2037036 | Resolved | Apr 1, 2021through Jun 30, 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
Matched to Boxborough ZIP 01719 using 75.9 PPM nearby hardness and 1 reported measurement benchmarks.
No urgent match
This profile does not trigger a treatment recommendation. Test at the tap before investing in equipment.
Affiliate 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
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.
Nearby USGS observations produce an estimate of 75.9 PPM, or 4.4 grains per gallon, classified as moderately hard. This is not a household tap measurement.
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.