Hardness
Moderately Hard
104 PPM · 6.1 GPG
Local water dashboard
Official source aggregationWater quality in Dillon, MT 59725
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Beaverhead County.
1 reported benchmark flag
- Primary matched system
- Dillon City Of
- Source water
- Groundwater
- County
- Beaverhead 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
7 systems
Serves 4,300 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
104 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
104
mg/L as CaCO₃ equivalent
Grains per gallon
6.1
1 GPG ≈ 17.1 PPM
What this means at home
At 104 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
15
Nearest site
48.2 mi
Observation range
Mar 8, 2016–Jun 9, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Big Hole River bl Big Lake Cr at Wisdom MT (Stream).USGS source documentation ↗
Regional context
Is 59725 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Dillon median
104 PPM
About the same1 indexed ZIP readings · Range 104–104 PPM
Montana median
122 PPM
18 PPM lower129 indexed ZIP readings · Range 0.2–799.5 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 pass1 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2027
Copper (CU90)
2.02 mg/L
Reported Dec 31, 1996
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
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 2.02
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 27
- Health-based
- 2
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Consumer Confidence Rule | MT0004249 | Resolved | Oct 1, 2025through Oct 6, 2025 |
| Consumer Confidence Rule | MT0002515 | Resolved | Jul 1, 2025through Jul 18, 2025 |
| Consumer Confidence Rule | MT0002171 | Resolved | Jul 1, 2025through Jul 17, 2025 |
| Lead and Copper Rule | MT0003968 | Resolved | Oct 1, 2024through Sep 20, 2025 |
| Lead and Copper Rule | MT0002515 | Resolved | Oct 1, 2024through Sep 18, 2025 |
| Lead and Copper Rule | MT0002171 | Resolved | Oct 1, 2024through Sep 16, 2025 |
| Consumer Confidence Rule | MT0004249 | Resolved | Oct 1, 2024through Oct 10, 2024 |
| Consumer Confidence Rule | MT0002515 | Resolved | Jul 1, 2024through Aug 21, 2024 |
| Consumer Confidence Rule | MT0002171 | Resolved | Jul 1, 2024through Aug 12, 2024 |
| Consumer Confidence Rule | MT0004249 | Resolved | Jul 1, 2024through Oct 10, 2024 |
| Consumer Confidence Rule | MT0003968 | Resolved | Oct 1, 2023through Oct 18, 2023 |
| Consumer Confidence Rule | MT0004249 | Resolved | Oct 1, 2023through Oct 18, 2023 |
| Consumer Confidence Rule | MT0002486 | Resolved | Jul 1, 2023through Jul 7, 2023 |
| Consumer Confidence Rule | MT0002515 | Resolved | Jul 1, 2023through Aug 17, 2023 |
| Consumer Confidence Rule | MT0002171 | Resolved | Jul 1, 2023through Jul 25, 2023 |
| E. COLI | MT0002486 | Resolved | Jun 14, 2023through Jul 14, 2023 |
| Revised Total Coliform RuleHealth-based | MT0002515 | Resolved | Dec 19, 2022through Nov 29, 2023 |
| E. COLI | MT0002515 | Resolved | Aug 24, 2022through Sep 25, 2022 |
| Lead and Copper Rule | MT0003968 | Resolved | Dec 30, 2021through Jan 7, 2022 |
| Lead and Copper Rule | MT0002515 | Resolved | Dec 30, 2021through Jan 7, 2022 |
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 Dillon ZIP 59725 using 104 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile) has 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 Dillon
Is tap water safe in Dillon?+
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 104 PPM, or 6.1 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.