Hardness
Soft
45.5 PPM · 2.7 GPG
Local water dashboard
Official source aggregationWater quality in Hartshorne, OK 74547
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Pittsburg County.
1 reported benchmark flag
- Primary matched system
- Hartshorne
- Source water
- Surface water
- County
- Pittsburg 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
0.0029 mg/L
19% of action level
Utility match
1 system
Serves 2,300 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
45.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
45.5
mg/L as CaCO₃ equivalent
Grains per gallon
2.7
1 GPG ≈ 17.1 PPM
What this means at home
At 45.5 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
3
Nearest site
67.3 mi
Observation range
Mar 3, 2016–May 25, 2023
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Pat Mayse Lk, Site MY nr Chicota, TX (Lake, Reservoir, Impoundment).USGS source documentation ↗
Regional context
Is 74547 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Hartshorne median
46 PPM
About the same1 indexed ZIP readings · Range 45.5–45.5 PPM
Oklahoma median
226 PPM
180 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)
0.0029 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 0.0029
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.083
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 23
- Health-based
- 21
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHMHealth-basedReported 0.083 MG/L · MCL 0.08 | OK3006101 | Archived | Oct 1, 2024through Dec 31, 2024 |
| TTHM | OK3006101 | Resolved | Sep 29, 2024through Dec 20, 2024 |
| TTHMHealth-basedReported 0.082 MG/L · MCL 0.08 | OK3006101 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.083 MG/L · MCL 0.08 | OK3006101 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.097 MG/L · MCL 0.08 | OK3006101 | Archived | Jan 1, 2024through Mar 31, 2024 |
| TTHMHealth-basedReported 0.086 MG/L · MCL 0.08 | OK3006101 | Archived | Jan 1, 2024through Mar 31, 2024 |
| TTHMHealth-basedReported 0.1 MG/L · MCL 0.08 | OK3006101 | Archived | Oct 1, 2023through Dec 31, 2023 |
| TTHMHealth-basedReported 0.09 MG/L · MCL 0.08 | OK3006101 | Archived | Oct 1, 2023through Dec 31, 2023 |
| TTHMHealth-basedReported 0.085 MG/L · MCL 0.08 | OK3006101 | Archived | Jul 1, 2023through Sep 30, 2023 |
| TTHMHealth-basedReported 0.107 MG/L · MCL 0.08 | OK3006101 | Archived | Jul 1, 2023through Sep 30, 2023 |
| TTHMHealth-basedReported 0.107 MG/L · MCL 0.08 | OK3006101 | Archived | Apr 1, 2023through Jun 30, 2023 |
| TTHMHealth-basedReported 0.088 MG/L · MCL 0.08 | OK3006101 | Archived | Apr 1, 2023through Jun 30, 2023 |
| TTHMHealth-basedReported 0.093 MG/L · MCL 0.08 | OK3006101 | Archived | Jan 1, 2023through Mar 31, 2023 |
| TTHMHealth-basedReported 0.085 MG/L · MCL 0.08 | OK3006101 | Archived | Jan 1, 2023through Mar 31, 2023 |
| TTHMHealth-basedReported 0.081 MG/L · MCL 0.08 | OK3006101 | Archived | Oct 1, 2022through Dec 31, 2022 |
| TTHMHealth-basedReported 0.082 MG/L · MCL 0.08 | OK3006101 | Archived | Jul 1, 2022through Sep 30, 2022 |
| TTHMHealth-basedReported 0.088 MG/L · MCL 0.08 | OK3006101 | Archived | Apr 1, 2022through Jun 30, 2022 |
| TTHMHealth-basedReported 0.083 MG/L · MCL 0.08 | OK3006101 | Archived | Apr 1, 2022through Jun 30, 2022 |
| TTHMHealth-basedReported 0.097 MG/L · MCL 0.08 | OK3006101 | Archived | Jan 1, 2022through Mar 31, 2022 |
| TTHMHealth-basedReported 0.084 MG/L · MCL 0.08 | OK3006101 | Archived | Jan 1, 2022through Mar 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 Hartshorne ZIP 74547 using 45.5 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 Hartshorne
Is tap water safe in Hartshorne?+
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 45.5 PPM, or 2.7 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.