Hardness
Hard
153 PPM · 8.9 GPG
Local water dashboard
Official source aggregationWater quality in Nowata, OK 74048
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Nowata County.
1 reported benchmark flag
- Primary matched system
- Nowata Municipal Authority
- Source water
- Surface water
- County
- Nowata 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
0.0012 mg/L
8% of action level
Utility match
1 system
Serves 3,971 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
153 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
153
mg/L as CaCO₃ equivalent
Grains per gallon
8.9
1 GPG ≈ 17.1 PPM
What this means at home
At 153 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
58 mi
Observation range
Jan 26, 2016–Apr 20, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Buffalo Creek at Tiff City, MO (Stream).USGS source documentation ↗
Regional context
Is 74048 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Nowata median
153 PPM
About the same1 indexed ZIP readings · Range 153–153 PPM
Oklahoma median
226 PPM
73 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)
0.0012 mg/L
Reported Dec 31, 2025
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 0.0012
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.085
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 15
- Health-based
- 13
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONSHealth-based | OK1021503 | Resolved | Oct 17, 2024through Jul 15, 2025 |
| LEAD AND COPPER RULE REVISIONS | OK1021503 | Resolved | Oct 17, 2024through Jul 15, 2025 |
| TTHMHealth-basedReported 0.085 MG/L · MCL 0.08 | OK1021503 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.087 MG/L · MCL 0.08 | OK1021503 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.098 MG/L · MCL 0.08 | OK1021503 | Archived | Jan 1, 2024through Mar 31, 2024 |
| TTHMHealth-basedReported 0.098 MG/L · MCL 0.08 | OK1021503 | Archived | Jan 1, 2024through Mar 31, 2024 |
| TTHMHealth-basedReported 0.103 MG/L · MCL 0.08 | OK1021503 | Archived | Oct 1, 2023through Dec 31, 2023 |
| TTHMHealth-basedReported 0.103 MG/L · MCL 0.08 | OK1021503 | Archived | Oct 1, 2023through Dec 31, 2023 |
| TTHMHealth-basedReported 0.109 MG/L · MCL 0.08 | OK1021503 | Archived | Jul 1, 2023through Sep 30, 2023 |
| TTHMHealth-basedReported 0.106 MG/L · MCL 0.08 | OK1021503 | Archived | Jul 1, 2023through Sep 30, 2023 |
| TTHMHealth-basedReported 0.085 MG/L · MCL 0.08 | OK1021503 | Archived | Oct 1, 2022through Dec 31, 2022 |
| TTHMHealth-basedReported 0.082 MG/L · MCL 0.08 | OK1021503 | Archived | Oct 1, 2022through Dec 31, 2022 |
| TTHMHealth-basedReported 0.088 MG/L · MCL 0.08 | OK1021503 | Archived | Apr 1, 2022through Jun 30, 2022 |
| TTHM | OK1021503 | Resolved | Dec 30, 2021through Aug 2, 2021 |
| TTHMHealth-basedReported 0.086 MG/L · MCL 0.08 | OK1021503 | Archived | 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 Nowata ZIP 74048 using 153 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
153 PPM is 1× 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 Nowata
Is tap water safe in Nowata?+
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 153 PPM, or 8.9 grains per gallon, classified as hard. This is not a household tap measurement.
Do I need a water softener?+
At 153 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.