Hardness
Very Hard
201.5 PPM · 11.8 GPG
Local water dashboard
Official source aggregationWater quality in Holdenville, OK 74848
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Hughes County.
1 reported benchmark flag
- Primary matched system
- Holdenville
- Source water
- Surface water
- County
- Hughes 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
0.0018 mg/L
12% of action level
Utility match
1 system
Serves 4,732 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
201.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
201.5
mg/L as CaCO₃ equivalent
Grains per gallon
11.8
1 GPG ≈ 17.1 PPM
What this means at home
At 201.5 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
2
Nearest site
56.1 mi
Observation range
Jan 5, 2016–May 13, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: North Canadian River near Harrah, OK (Stream).USGS source documentation ↗
Regional context
Is 74848 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Holdenville median
202 PPM
About the same1 indexed ZIP readings · Range 201.5–201.5 PPM
Oklahoma median
226 PPM
24 PPM lower148 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 pass1 fail
Lead (PB90)
0.0018 mg/L
Reported Dec 31, 2023
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 0.0018
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.082
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 53
- Health-based
- 32
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Nov 1, 2025through Nov 30, 2025 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Oct 1, 2025through Oct 31, 2025 |
| TTHMHealth-basedReported 0.082 MG/L · MCL 0.08 | OK1020803 | Archived | Apr 1, 2025through Jun 30, 2025 |
| LEAD AND COPPER RULE REVISIONS | OK1020803 | Resolved | Oct 17, 2024through Jul 15, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | OK1020803 | Resolved | Oct 17, 2024through Jul 15, 2025 |
| Revised Total Coliform Rule | OK1020803 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| TTHMHealth-basedReported 0.091 MG/L · MCL 0.08 | OK1020803 | Archived | Oct 1, 2024through Dec 31, 2024 |
| Chlorine | OK1020803 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Aug 1, 2024through Aug 31, 2024 |
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Aug 1, 2024through Aug 31, 2024 |
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Jul 1, 2024through Jul 31, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Jul 1, 2024through Jul 31, 2024 |
| Consumer Confidence Rule | OK1020803 | Resolved | Jul 1, 2024through May 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | OK1020803 | Resolved | Jun 1, 2024through Jun 30, 2024 |
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Jun 1, 2024through Jun 30, 2024 |
| Interim Enhanced Surface Water Treatment Rule | OK1020803 | Resolved | May 1, 2024through May 31, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1020803 | Archived | May 1, 2024through May 31, 2024 |
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | May 1, 2024through May 31, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1020803 | Archived | May 1, 2024through May 31, 2024 |
| Surface Water Treatment RuleHealth-based | OK1020803 | Archived | Apr 1, 2024through Apr 30, 2024 |
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 Holdenville ZIP 74848 using 201.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
201.5 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 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 Holdenville
Is tap water safe in Holdenville?+
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 201.5 PPM, or 11.8 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 201.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.