Hardness
Very Hard
273.5 PPM · 16 GPG
Local water dashboard
Official source aggregationWater quality in Hominy, OK 74035
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Osage County.
2 reported benchmark flags
- Primary matched system
- Hominy
- Source water
- Surface water
- County
- Osage 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
1 system
Serves 2,584 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
273.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
273.5
mg/L as CaCO₃ equivalent
Grains per gallon
16
1 GPG ≈ 17.1 PPM
What this means at home
At 273.5 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
34
Nearest site
7.9 mi
Observation range
Jun 30, 2016–Aug 8, 2018
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 22N-10E-21 BAB 1 (Well).USGS source documentation ↗
Regional context
Is 74035 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Hominy median
274 PPM
About the same1 indexed ZIP readings · Range 273.5–273.5 PPM
Oklahoma median
226 PPM
48 PPM higher148 indexed ZIP readings · Range 7–610 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)
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
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.093
EPA limit 0.08
Total Haloacetic Acids (HAA5)
Measured in MG/L
Local 0.087
EPA limit 0.06
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 290
- Health-based
- 162
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHM | OK1021306 | Resolved | Dec 30, 2025through Mar 6, 2026 |
| Total Haloacetic Acids (HAA5) | OK1021306 | Resolved | Dec 30, 2025through Mar 6, 2026 |
| Lead and Copper Rule | OK1021306 | Addressed | Oct 1, 2025 |
| CARBON, TOTALHealth-basedReported 0.83 RATIO | OK1021306 | Archived | Oct 1, 2025through Dec 31, 2025 |
| TTHMHealth-basedReported 0.093 MG/L · MCL 0.08 | OK1021306 | Archived | Oct 1, 2025through Dec 31, 2025 |
| TTHMHealth-basedReported 0.103 MG/L · MCL 0.08 | OK1021306 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.087 MG/L · MCL 0.06 | OK1021306 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.081 MG/L · MCL 0.06 | OK1021306 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Total Haloacetic Acids (HAA5) | OK1021306 | Resolved | Sep 29, 2025through Mar 3, 2026 |
| TTHM | OK1021306 | Resolved | Sep 29, 2025through Mar 3, 2026 |
| Chlorine | OK1021306 | Archived | Aug 1, 2025through Aug 31, 2025 |
| Revised Total Coliform Rule | OK1021306 | Archived | Aug 1, 2025through Aug 31, 2025 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1021306 | Archived | Jul 1, 2025through Jul 31, 2025 |
| Surface Water Treatment RuleHealth-based | OK1021306 | Archived | Jul 1, 2025through Jul 31, 2025 |
| Surface Water Treatment RuleHealth-based | OK1021306 | Archived | Jul 1, 2025through Jul 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.098 MG/L · MCL 0.06 | OK1021306 | Archived | Jul 1, 2025through Sep 30, 2025 |
| CARBON, TOTALHealth-basedReported 0.7 RATIO | OK1021306 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.101 MG/L · MCL 0.06 | OK1021306 | Archived | Jul 1, 2025through Sep 30, 2025 |
| TTHMHealth-basedReported 0.102 MG/L · MCL 0.08 | OK1021306 | Archived | Jul 1, 2025through Sep 30, 2025 |
| TTHMHealth-basedReported 0.113 MG/L · MCL 0.08 | OK1021306 | Archived | Jul 1, 2025through Sep 30, 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 Hominy ZIP 74035 using 273.5 PPM nearby hardness and 3 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
273.5 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
TTHM, Total Haloacetic Acids (HAA5) 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 Hominy
Is tap water safe in Hominy?+
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 273.5 PPM, or 16 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 273.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.