Hardness
Moderately Hard
80.1 PPM · 4.7 GPG
Local water dashboard
Official source aggregationWater quality in Denton, MT 59430
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Fergus County.
1 active health-based violation
- Primary matched system
- Denton Town Of
- Source water
- Surface water
- County
- Fergus County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
1 active health-based record
Lead 90th percentile
0.004 mg/L
27% of action level
Utility match
1 system
Serves 255 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
80.1 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
80.1
mg/L as CaCO₃ equivalent
Grains per gallon
4.7
1 GPG ≈ 17.1 PPM
What this means at home
At 80.1 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
2
Nearest site
59 mi
Observation range
Mar 4, 2017–Feb 26, 2025
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: KINGS HILL SNOW SITE, MT (Land).USGS source documentation ↗
Regional context
Is 59430 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Denton median
80 PPM
About the same1 indexed ZIP readings · Range 80.1–80.1 PPM
Montana median
122 PPM
42 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 pass
Lead (PB90)
0.004 mg/L
Reported Dec 31, 2025
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.
Lead (90th percentile)
Measured in mg/L
Local 0.004
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 73
- Health-based
- 63
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Surface Water Treatment Rule | MT0000199 | Archived | Mar 1, 2026through Mar 31, 2026 |
| Surface Water Treatment Rule | MT0000199 | Archived | Feb 1, 2026through Feb 28, 2026 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Feb 1, 2026through Feb 28, 2026 |
| Surface Water Treatment Rule | MT0000199 | Archived | Jan 1, 2026through Jan 31, 2026 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Jan 1, 2026through Jan 31, 2026 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Dec 1, 2025through Dec 31, 2025 |
| Surface Water Treatment Rule | MT0000199 | Archived | Dec 1, 2025through Dec 31, 2025 |
| Surface Water Treatment Rule | MT0000199 | Archived | Nov 1, 2025through Nov 30, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Nov 1, 2025through Nov 30, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Oct 1, 2025through Oct 31, 2025 |
| Surface Water Treatment Rule | MT0000199 | Archived | Oct 1, 2025through Oct 31, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Sep 1, 2025through Sep 30, 2025 |
| Surface Water Treatment Rule | MT0000199 | Archived | Sep 1, 2025through Sep 30, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Aug 1, 2025through Aug 31, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Jul 1, 2025through Jul 31, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Jun 1, 2025through Jun 30, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | May 1, 2025through May 31, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Apr 1, 2025through Apr 30, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Mar 1, 2025through Mar 31, 2025 |
| Surface Water Treatment RuleHealth-based | MT0000199 | Archived | Feb 1, 2025through Feb 28, 2025 |
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 Denton ZIP 59430 using 80.1 PPM nearby hardness and 1 reported measurement benchmarks.
No urgent match
Start with an independent water test
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
Water questions for Denton
Is tap water safe in Denton?+
EPA ECHO reports 1 active health-based violation 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 80.1 PPM, or 4.7 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.