Hardness
Very Hard
272 PPM · 15.9 GPG
Local water dashboard
Official source aggregationWater quality in Mills, WY 82644
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Natrona County.
2 reported benchmark flags
- Primary matched system
- Mills, City Of
- Source water
- Groundwater influenced by surface water + Surface water + Groundwater
- County
- Natrona 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
9 systems
Serves 4,050 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
272 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
272
mg/L as CaCO₃ equivalent
Grains per gallon
15.9
1 GPG ≈ 17.1 PPM
What this means at home
At 272 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
9
Nearest site
8.3 mi
Observation range
Jan 7, 2016–May 29, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: NORTH PLATTE RIVER BELOW CASPER, WY (Stream).USGS source documentation ↗
Regional context
Is 82644 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Mills median
272 PPM
About the same1 indexed ZIP readings · Range 272–272 PPM
Wyoming median
235 PPM
37 PPM higher93 indexed ZIP readings · Range 3.2–1905 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, 2025
Copper (CU90)
2.04 mg/L
Reported Dec 31, 2020
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 2.04
EPA limit 1.3
TTHM
Measured in MG/L
Local 0.081
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 23
- Health-based
- 4
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | WY5600756 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| Consumer Confidence Rule | WY5601579 | Unaddressed | Jul 1, 2025 |
| Consumer Confidence Rule | WY5601494 | Unaddressed | Jul 1, 2025 |
| TTHMHealth-basedReported 0.081 MG/L · MCL 0.08 | WY5600036 | Resolved | Jan 1, 2025through Mar 31, 2025 |
| Lead and Copper Rule | WY5601579 | Resolved | Dec 30, 2024through Feb 20, 2025 |
| Surface Water Treatment Rule | WY5600828 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Revised Total Coliform Rule | WY5600828 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| LEAD AND COPPER RULE REVISIONS | WY5600756 | Resolved | Oct 17, 2024through Jul 2, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | WY5600756 | Resolved | Oct 17, 2024through Nov 21, 2025 |
| TTHMHealth-basedReported 0.081 MG/L · MCL 0.08 | WY5600036 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| TTHMHealth-basedReported 0.084 MG/L · MCL 0.08 | WY5600036 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| Consumer Confidence Rule | WY5600756 | Unaddressed | Jul 1, 2024 |
| Consumer Confidence Rule | WY5600756 | Resolved | Jul 1, 2023through Nov 6, 2023 |
| Consumer Confidence Rule | WY5600756 | Resolved | Oct 1, 2022through Dec 19, 2022 |
| Consumer Confidence Rule | WY5600756 | Resolved | Jul 1, 2022through Dec 19, 2022 |
| Surface Water Treatment Rule | WY5600828 | Resolved | Apr 1, 2022through Apr 30, 2022 |
| Lead and Copper Rule | WY5600756 | Resolved | Dec 30, 2021through Nov 6, 2023 |
| Revised Total Coliform Rule | WY5600080 | Resolved | Aug 1, 2021through Aug 31, 2021 |
| Lead and Copper Rule | WY5600756 | Addressed | Dec 30, 2020 |
| Consumer Confidence Rule | WY5600828 | Addressed | Oct 1, 2020 |
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 Mills ZIP 82644 using 272 PPM nearby hardness and 3 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
272 PPM is 2× 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 systemsDrinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile), TTHM 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 Mills
Is tap water safe in Mills?+
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 272 PPM, or 15.9 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 272 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.