Hardness
Soft
11.9 PPM · 0.7 GPG
Local water dashboard
Official source aggregationWater quality in El Dorado, AR 71730
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Union County.
2 reported benchmark flags
- Primary matched system
- El Dorado Waterworks
- Source water
- Groundwater
- County
- Union 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
0.002 mg/L
13% of action level
Utility match
1 system
Serves 17,932 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
11.9 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
11.9
mg/L as CaCO₃ equivalent
Grains per gallon
0.7
1 GPG ≈ 17.1 PPM
What this means at home
At 11.9 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
5.1 mi
Observation range
Aug 23, 2016–Jul 25, 2025
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 17S16W24BDB1 (Well).USGS source documentation ↗
Regional context
Is 71730 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
El Dorado median
12 PPM
About the same1 indexed ZIP readings · Range 11.9–11.9 PPM
Arkansas median
71 PPM
59 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 pass2 fail
Lead (PB90)
0.002 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
3 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.002
EPA limit 0.015
TTHM
Measured in UG/L
Local 84
EPA limit 0.08
Asbestos
Measured in MFL
Local 9.8
EPA limit 7
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 4
- Health-based
- 3
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHMHealth-basedReported 84 UG/L · MCL 0.08 | AR0000550 | Archived | Oct 1, 2025through Dec 31, 2025 |
| TTHMHealth-basedReported 81 UG/L · MCL 0.08 | AR0000550 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Revised Total Coliform Rule | AR0000550 | Resolved | Nov 1, 2022through Nov 30, 2022 |
| AsbestosHealth-basedReported 9.8 MFL · MCL 7 | AR0000550 | Resolved | Jan 1, 2021through Mar 31, 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 El Dorado ZIP 71730 using 11.9 PPM nearby hardness and 3 reported measurement benchmarks.
Drinking water protection
Under-Sink Reverse Osmosis System
TTHM, Asbestos 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.
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Frequently asked
Water questions for El Dorado
Is tap water safe in El Dorado?+
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 11.9 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.