Maricopa Water Hardness & Quality Report (2026)
Water Hardness
21.6 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
1059.5 mg/L
Est. Daily Cost
$0.99
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Maricopa, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Maricopa | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Maricopa compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Maricopa, Arizona | 370 mg/L | 5 ppt | 🔴 Very Hard | mixed |
| Sun Lakes, Arizona | 315 mg/L | 4.3 ppt | 🔴 Very Hard | mixed |
| Ahwatukee Foothills, Arizona | 172.5 mg/L | 2.6 ppt | 🟠 Hard | mixed |
| Chandler, Arizona | 175.5 mg/L | 2.7 ppt | 🟠 Hard | mixed |
| Casa Grande, Arizona | 415.5 mg/L | 5.5 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Maricopa compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Maricopa | 370 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Maricopa's Water Unique?
Local geology and source profile
Maricopa, Arizona, in Pinal County south of Phoenix — one of the fastest-growing cities in the United States in the 2000s (growing from under 1,000 residents in 2000 to over 60,000 today), a major far-south Phoenix exurban community known as a master-planned desert community for working-class and middle-class buyers, with dramatic Sonoran Desert scenery at the base of the Estrella and South Mountain ranges — draws its municipal water supply from the Maricopa–Stanfield Sub-basin groundwater and CAP Colorado River imports via the City of Maricopa Water Division. Water hardness in Maricopa measures 370 mg/L — classified as extremely hard.
Maricopa's extremely hard supply reflects the Pinal County Sonoran Desert alluvial basin's concentrated calcareous geology. The Maricopa–Stanfield Sub-basin (the deep calcareous alluvial fill of the Sonoran Desert basin south of the Salt River Project) contains: deep Quaternary Sonoran Desert caliche-rich alluvial fan deposits (calcareous caliche hardpan accumulates extraordinary dissolved calcium through centuries of evaporative concentration at the desert basin floor); CAP Colorado River imports (extremely hard, approximately 300–350 mg/L at Pinal County delivery); and deep basin groundwater of very long residence time in the caliche-rich Sonoran Desert sediments. The Sonoran Desert evaporative concentration produces the extraordinary 370 mg/L.
At 370 mg/L, Maricopa residents face very severe hard water challenges. Scale deposits form extremely rapidly on all fixtures and appliances — weekly descaling and appliance protection measures are strongly recommended. City of Maricopa Water Division consistently delivers water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Maricopa-Stanfield Sub-basin (Central Arizona Groundwater Basin) and Central Arizona Project (CAP) Colorado River import via the City of Maricopa Water Division — the Pinal County far south Maricopa Sonoran Desert alluvial basin (deep calcareous desert alluvium + CAP Colorado import); extremely hard supply at 370 mg/L — reflecting the Sonoran Desert concentrated calcareous alluvial groundwater.