Hardness
Very Hard
244 PPM · 14.3 GPG
Local water dashboard
Official source aggregationWater quality in Three Points, AZ 85736
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Pima County.
No active health-based violation reported
- Primary matched system
- Thim Utility Company
- Source water
- Groundwater
- County
- Pima 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
5 systems
Serves 310 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
244 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
244
mg/L as CaCO₃ equivalent
Grains per gallon
14.3
1 GPG ≈ 17.1 PPM
What this means at home
At 244 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
24
Nearest site
34.3 mi
Observation range
Jan 11, 2016–Mar 31, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: D-13-12 10DDA1 (Well).USGS source documentation ↗
Regional context
Is 85736 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Three Points median
227 PPM
17 PPM higher2 indexed ZIP readings · Range 209.5–244 PPM
Arizona median
241 PPM
About the same285 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
- 17
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | AZ0410132 | Unaddressed | Mar 1, 2026 |
| LEAD AND COPPER RULE REVISIONS | AZ0410132 | Unaddressed | Jul 2, 2025 |
| Total Haloacetic Acids (HAA5) | AZ0410206 | Archived | Jan 1, 2025through Dec 31, 2025 |
| TTHM | AZ0410206 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Lead and Copper Rule | AZ0410132 | Resolved | Oct 1, 2024through Oct 15, 2025 |
| Lead and Copper Rule | AZ0410265 | Resolved | Jan 1, 2024through Jan 17, 2024 |
| Public Notice | AZ0410132 | Resolved | Jan 1, 2024through Sep 23, 2025 |
| Revised Total Coliform Rule | AZ0410132 | Resolved | Jan 1, 2024through Mar 5, 2024 |
| Nitrate | AZ0410132 | Resolved | Jan 1, 2024through Dec 31, 2024 |
| E. COLI | AZ0410132 | Resolved | Aug 8, 2023through Sep 22, 2023 |
| Chlorine | AZ0410317 | Resolved | Oct 1, 2022through Dec 31, 2022 |
| Lead and Copper Rule | AZ0410132 | Resolved | Oct 1, 2022through Oct 18, 2023 |
| Revised Total Coliform Rule | AZ0410132 | Resolved | Dec 1, 2021through Jan 21, 2022 |
| Public Notice | AZ0410132 | Resolved | Oct 2, 2021through Dec 8, 2021 |
| Consumer Confidence Rule | AZ0410132 | Resolved | Oct 2, 2021through Nov 8, 2021 |
| Chlorine | AZ0410132 | Resolved | Oct 1, 2021through Dec 31, 2021 |
| Consumer Confidence Rule | AZ0410317 | Unaddressed | Jul 1, 2002 |
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 Three Points ZIP 85736 using 244 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
244 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 Three Points
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Three Points
Is tap water safe in Three Points?+
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 244 PPM, or 14.3 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 244 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.