Hardness
Very Hard
228 PPM · 13.3 GPG
Local water dashboard
Official source aggregationWater quality in Gilbert, AZ 85236
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Maricopa County.
No active health-based violation reported
- Primary matched system
- Gilbert, Town Of
- Source water
- Surface water + Groundwater
- County
- Maricopa 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
2 systems
Serves 247,600 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
228 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
228
mg/L as CaCO₃ equivalent
Grains per gallon
13.3
1 GPG ≈ 17.1 PPM
What this means at home
At 228 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
29
Nearest site
16.8 mi
Observation range
Jan 4, 2016–May 29, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 40th Street and the Salt River at Phoenix, Az. (Stream).USGS source documentation ↗
Regional context
Is 85236 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Gilbert median
228 PPM
About the same7 indexed ZIP readings · Range 228–261.5 PPM
Arizona median
241 PPM
13 PPM lower285 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 pass
Lead (PB90)
0 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 182
- Health-based
- 1
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | AZ0407092 | Unaddressed | Feb 1, 2026 |
| Bromate | AZ0407092 | Archived | Jan 1, 2026through Jan 31, 2026 |
| Lead and Copper Rule | AZ0407092 | Unaddressed | Jan 1, 2026 |
| Surface Water Treatment Rule | AZ0407092 | Resolved | Dec 1, 2025through Dec 31, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AZ0407092 | Resolved | Oct 1, 2025through Oct 31, 2025 |
| Surface Water Treatment Rule | AZ0407092 | Resolved | Oct 1, 2025through Oct 31, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AZ0407092 | Resolved | Sep 1, 2025through Sep 30, 2025 |
| Revised Total Coliform Rule | AZ0407092 | Resolved | Jul 1, 2025through Aug 29, 2025 |
| Nitrate | AZ0407092 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| Surface Water Treatment Rule | AZ0407092 | Resolved | Feb 1, 2025through Feb 28, 2025 |
| Public Notice | AZ0407900 | Resolved | Dec 20, 2024through Jun 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AZ0407092 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Surface Water Treatment Rule | AZ0407092 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| LEAD AND COPPER RULE REVISIONS | AZ0407900 | Resolved | Oct 17, 2024through Jul 15, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | AZ0407900 | Resolved | Oct 17, 2024through Jul 15, 2025 |
| Consumer Confidence Rule | AZ0407900 | Resolved | Oct 2, 2024through Mar 10, 2025 |
| Nitrate | AZ0407092 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Nitrate | AZ0407092 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Nitrate | AZ0407092 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Nitrate | AZ0407092 | Resolved | Oct 1, 2024through Dec 31, 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 Gilbert ZIP 85236 using 228 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
228 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 systemsAffiliate 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 Gilbert
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Gilbert
Is tap water safe in Gilbert?+
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 228 PPM, or 13.3 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 228 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.