Hardness
Very Hard
479 PPM · 28 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 Sierra County.
At a glance
EPA quarter 2026Q2
Hardness
Very Hard
479 PPM · 28 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.0027 mg/L
18% of action level
Utility match
1 system
Serves 172 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
479 PPM
Parts per million
479
mg/L as CaCO₃ equivalent
Grains per gallon
28
1 GPG ≈ 17.1 PPM
What this means at home
At 479 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
41
Nearest site
14.7 mi
Observation range
Apr 4, 2016–Sep 29, 2020
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 17S.05W.24.314 H2-R (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.
Hillsboro median
479 PPM
About the same1 indexed ZIP readings · Range 479–479 PPM
New Mexico median
228 PPM
251 PPM higher194 indexed ZIP readings · Range 74.2–688.5 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)
0.0027 mg/L
Reported Jun 30, 2026
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 0.0027
EPA limit 0.015
100% line = listed limit
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | NM3514127 | Resolved | Jul 1, 2025through Dec 10, 2025 |
| Chlorine | NM3514127 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Lead and Copper Rule | NM3514127 | Resolved | Oct 1, 2024through Dec 10, 2025 |
| Consumer Confidence Rule | NM3514127 | Resolved | Jul 1, 2021through Jul 30, 2021 |
| Revised Total Coliform Rule | NM3514127 | Resolved | May 1, 2021through May 31, 2021 |
| Chlorine | NM3514127 | Resolved | Apr 1, 2021through Jun 15, 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 Hillsboro ZIP 88042 using 479 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
479 PPM is 4× the high-hardness trigger used by this matcher.
Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.
Compare whole-house systemsAffiliate 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 479 PPM, or 28 grains per gallon, classified as very hard. This is not a household tap measurement.
At 479 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.