Hardness
Soft
11.3 PPM · 0.7 GPG
Local water dashboard
Official source aggregationWater quality in Danville, AR 72833
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Yell County.
1 reported benchmark flag
- Primary matched system
- Danville Waterworks
- Source water
- Surface water
- County
- Yell 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
0.013 mg/L
87% of action level
Utility match
1 system
Serves 2,810 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
11.3 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
11.3
mg/L as CaCO₃ equivalent
Grains per gallon
0.7
1 GPG ≈ 17.1 PPM
What this means at home
At 11.3 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
17
Nearest site
24.6 mi
Observation range
Feb 11, 2016–May 29, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Whig Cr @ Confluence with Ark Rv nr Dardanelle (Stream).USGS source documentation ↗
Regional context
Is 72833 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Danville median
11 PPM
About the same1 indexed ZIP readings · Range 11.3–11.3 PPM
Arkansas median
71 PPM
60 PPM lower210 indexed ZIP readings · Range 4.8–283 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)
0.013 mg/L
Reported Dec 31, 2003
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.013
EPA limit 0.015
TTHM
Measured in UG/L
Local 91
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 25
- Health-based
- 22
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Dec 1, 2025through Dec 31, 2025 |
| TTHMHealth-basedReported 91 UG/L · MCL 0.08 | AR0000603 | Archived | Jul 1, 2025through Sep 30, 2025 |
| TTHMHealth-basedReported 83 UG/L · MCL 0.08 | AR0000603 | Archived | Apr 1, 2025through Jun 30, 2025 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Feb 1, 2025through Feb 28, 2025 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Jan 1, 2025through Jan 31, 2025 |
| TTHMHealth-basedReported 86 UG/L · MCL 0.08 | AR0000603 | Archived | Jan 1, 2025through Mar 31, 2025 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Feb 1, 2024through Feb 29, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Jan 1, 2024through Jan 31, 2024 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Jan 1, 2024through Jan 31, 2024 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Jan 1, 2023through Jan 31, 2023 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Dec 1, 2022through Dec 31, 2022 |
| Public Notice | AR0000603 | Addressed | Nov 1, 2022 |
| Long Term 2 Enhanced Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Nov 1, 2022through Nov 30, 2022 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Nov 1, 2022through Nov 30, 2022 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Oct 1, 2022through Oct 31, 2022 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Aug 1, 2022through Aug 31, 2022 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Jan 1, 2022through Jan 31, 2022 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Dec 1, 2021through Dec 31, 2021 |
| Surface Water Treatment RuleHealth-based | AR0000603 | Archived | Nov 1, 2021through Nov 30, 2021 |
| Public Notice | AR0000603 | Resolved | Jun 1, 2021through Sep 24, 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
Your personalized water action plan
Matched to Danville ZIP 72833 using 11.3 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
TTHM 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 Danville
Is tap water safe in Danville?+
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 11.3 PPM, or 0.7 grains per gallon, classified as soft. 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.