Hardness
Very Hard
288 PPM · 16.8 GPG
Local water dashboard
Official source aggregationWater quality in Casa Grande, AZ 85193
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Pinal County.
1 reported benchmark flag
- Primary matched system
- Arizona Water Co - Pinal Valley
- Source water
- Groundwater
- County
- Pinal 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 mg/L
0% of action level
Utility match
8 systems
Serves 134,432 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
288 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
288
mg/L as CaCO₃ equivalent
Grains per gallon
16.8
1 GPG ≈ 17.1 PPM
What this means at home
At 288 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
39
Nearest site
41.5 mi
Observation range
Jan 11, 2016–Dec 18, 2024
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: D-01-02 10ACA1 (Well).USGS source documentation ↗
Regional context
Is 85193 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Casa Grande median
288 PPM
About the same3 indexed ZIP readings · Range 246–288 PPM
Arizona median
241 PPM
47 PPM higher285 indexed ZIP readings · Range 66.4–1250 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 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
EPA limit 0.015
Arsenic
Measured in MG/L
Local 0.011
EPA limit 0.01
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 37
- Health-based
- 18
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | AZ0411135 | Unaddressed | Jan 1, 2026 |
| Public Notice | AZ0411135 | Resolved | Nov 19, 2025through Dec 12, 2025 |
| Lead and Copper Rule | AZ0411135 | Unaddressed | Oct 1, 2025 |
| E. COLI | AZ0411009 | Resolved | Aug 20, 2025through Dec 16, 2025 |
| Arsenic | AZ0411009 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| LEAD AND COPPER RULE REVISIONS | AZ0411076 | Resolved | Oct 17, 2024through Nov 13, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | AZ0411076 | Resolved | Oct 17, 2024through Nov 13, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | AZ0411012 | Resolved | Oct 17, 2024through Nov 12, 2024 |
| LEAD AND COPPER RULE REVISIONS | AZ0411012 | Resolved | Oct 17, 2024through Nov 12, 2024 |
| LEAD AND COPPER RULE REVISIONS | AZ0411061 | Resolved | Oct 17, 2024through Nov 7, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | AZ0411061 | Resolved | Oct 17, 2024through Nov 7, 2024 |
| Total Haloacetic Acids (HAA5) | AZ0411135 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| TTHM | AZ0411135 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| ArsenicHealth-basedReported 0.011 MG/L · MCL 0.01 | AZ0411383 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Public Notice | AZ0411383 | Resolved | Mar 31, 2024through Apr 15, 2024 |
| ArsenicHealth-basedReported 0.012 MG/L · MCL 0.01 | AZ0411383 | Resolved | Jan 1, 2024through Mar 31, 2024 |
| Revised Total Coliform RuleHealth-based | AZ0411383 | Resolved | Dec 10, 2023through Jun 12, 2024 |
| E. COLI | AZ0411383 | Resolved | Nov 23, 2023through Dec 29, 2023 |
| ArsenicHealth-basedReported 0.013 MG/L · MCL 0.01 | AZ0411383 | Resolved | Oct 1, 2023through Dec 31, 2023 |
| Revised Total Coliform Rule | AZ0411151 | Resolved | Sep 1, 2023through Feb 27, 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 Casa Grande ZIP 85193 using 288 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
288 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
Arsenic 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.
Nearby indexed reports
Compare ZIPs in Casa Grande
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Casa Grande
Is tap water safe in Casa Grande?+
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 288 PPM, or 16.8 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 288 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.