Hardness
Very Hard
274.5 PPM · 16.1 GPG
Local water dashboard
Official source aggregationWater quality in Atoka, OK 74525
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Atoka County.
1 reported benchmark flag
- Primary matched system
- Atoka
- Source water
- Surface water
- County
- Atoka 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
0.0013 mg/L
9% of action level
Utility match
1 system
Serves 2,988 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
274.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
274.5
mg/L as CaCO₃ equivalent
Grains per gallon
16.1
1 GPG ≈ 17.1 PPM
What this means at home
At 274.5 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
8
Nearest site
39.6 mi
Observation range
Jun 8, 2016–Apr 6, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Lk Texoma at Hwy 70 Bridge nr Little City, OK (Lake, Reservoir, Impoundment).USGS source documentation ↗
Regional context
Is 74525 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Atoka median
275 PPM
About the same1 indexed ZIP readings · Range 274.5–274.5 PPM
Oklahoma median
226 PPM
49 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 pass1 fail
Lead (PB90)
0.0013 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 0.0013
EPA limit 0.015
Total Haloacetic Acids (HAA5)
Measured in MG/L
Local 0.073
EPA limit 0.06
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 23
- Health-based
- 22
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Total Haloacetic Acids (HAA5)Health-basedReported 0.073 MG/L · MCL 0.06 | OK1010401 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.072 MG/L · MCL 0.06 | OK1010401 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.073 MG/L · MCL 0.06 | OK1010401 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.072 MG/L · MCL 0.06 | OK1010401 | Archived | Jul 1, 2025through Sep 30, 2025 |
| CARBON, TOTALHealth-basedReported 0.98 RATIO | OK1010401 | Archived | Apr 1, 2025through Jun 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.069 MG/L · MCL 0.06 | OK1010401 | Archived | Apr 1, 2025through Jun 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.067 MG/L · MCL 0.06 | OK1010401 | Archived | Apr 1, 2025through Jun 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.065 MG/L · MCL 0.06 | OK1010401 | Archived | Jan 1, 2025through Mar 31, 2025 |
| Surface Water Treatment RuleHealth-based | OK1010401 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Chlorite | OK1010401 | Resolved | Aug 1, 2024through Aug 31, 2024 |
| CARBON, TOTALHealth-basedReported 0.99 RATIO | OK1010401 | Archived | Oct 1, 2023through Dec 31, 2023 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.067 MG/L · MCL 0.06 | OK1010401 | Archived | Oct 1, 2023through Dec 31, 2023 |
| CARBON, TOTALHealth-basedReported 0.96 RATIO | OK1010401 | Archived | Jul 1, 2023through Sep 30, 2023 |
| CARBON, TOTALHealth-basedReported 0.96 RATIO | OK1010401 | Archived | Apr 1, 2023through Jun 30, 2023 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1010401 | Resolved | Mar 1, 2023through Mar 31, 2023 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1010401 | Resolved | Feb 1, 2023through Feb 28, 2023 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1010401 | Resolved | Jan 1, 2023through Jan 31, 2023 |
| CARBON, TOTALHealth-basedReported 0.92 RATIO | OK1010401 | Archived | Jan 1, 2023through Mar 31, 2023 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | OK1010401 | Resolved | Dec 1, 2022through Dec 31, 2022 |
| Surface Water Treatment RuleHealth-based | OK1010401 | Resolved | Dec 1, 2022through Dec 31, 2022 |
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 Atoka ZIP 74525 using 274.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
274.5 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
Total Haloacetic Acids (HAA5) 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 Atoka
Is tap water safe in Atoka?+
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 274.5 PPM, or 16.1 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 274.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.