Hardness
Very Hard
380 PPM · 22.2 GPG
Local water dashboard
Official source aggregationWater quality in Chandler, OK 74834
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Lincoln County.
1 active health-based violation
- Primary matched system
- Chandler
- Source water
- Surface water
- County
- Lincoln County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
1 active health-based record
Lead 90th percentile
0.0022 mg/L
15% of action level
Utility match
1 system
Serves 3,142 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
380 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
380
mg/L as CaCO₃ equivalent
Grains per gallon
22.2
1 GPG ≈ 17.1 PPM
What this means at home
At 380 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
5
Nearest site
22.3 mi
Observation range
Jan 5, 2016–May 21, 2026
Estimate confidence
Moderate
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 74834 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Chandler median
380 PPM
About the same1 indexed ZIP readings · Range 380–380 PPM
Oklahoma median
226 PPM
154 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)
0.0022 mg/L
Reported Dec 31, 2024
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 0.0022
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.09
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 16
- Health-based
- 9
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHM | OK1020702 | Unaddressed | Dec 30, 2025 |
| TTHM | OK1020702 | Resolved | Apr 1, 2025through Jun 4, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | OK1020702 | Addressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONS | OK1020702 | Addressed | Oct 17, 2024 |
| TTHMHealth-basedReported 0.09 MG/L · MCL 0.08 | OK1020702 | Resolved | Jan 1, 2023through Mar 31, 2023 |
| TTHMHealth-basedReported 0.096 MG/L · MCL 0.08 | OK1020702 | Resolved | Jan 1, 2023through Mar 31, 2023 |
| Lead and Copper Rule | OK1020702 | Resolved | Jan 1, 2023through Jan 17, 2023 |
| TTHMHealth-basedReported 0.087 MG/L · MCL 0.08 | OK1020702 | Resolved | Oct 1, 2022through Dec 31, 2022 |
| TTHMHealth-basedReported 0.095 MG/L · MCL 0.08 | OK1020702 | Resolved | Oct 1, 2022through Dec 31, 2022 |
| Total Haloacetic Acids (HAA5) | OK1020702 | Resolved | Sep 29, 2022through Dec 13, 2022 |
| TTHM | OK1020702 | Resolved | Sep 29, 2022through Dec 13, 2022 |
| TTHMHealth-basedReported 0.097 MG/L · MCL 0.08 | OK1020702 | Resolved | Jul 1, 2022through Sep 30, 2022 |
| TTHMHealth-basedReported 0.087 MG/L · MCL 0.08 | OK1020702 | Resolved | Jul 1, 2022through Sep 30, 2022 |
| TTHMHealth-basedReported 0.085 MG/L · MCL 0.08 | OK1020702 | Resolved | Apr 1, 2022through Jun 30, 2022 |
| TTHMHealth-basedReported 0.097 MG/L · MCL 0.08 | OK1020702 | Resolved | Apr 1, 2022through Jun 30, 2022 |
| Lead and Copper Rule | OK1020702 | Resolved | Jan 1, 2022through Jan 17, 2023 |
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 Chandler ZIP 74834 using 380 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
380 PPM is 3× 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, LEAD AND COPPER RULE REVISIONS 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 Chandler
Is tap water safe in Chandler?+
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 380 PPM, or 22.2 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 380 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.