How does Casas Adobes's water compare to the national average?

The USA national average is 151 mg/L. Casas Adobes (≈ 180+ mg/L) is 189 mg/L harder than average.

Casas Adobes Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

mixed

pH Level

8.5

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

1274.4 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · est.

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 Casas Adobes, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Casas Adobes	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Casas Adobes compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Casas Adobes, Arizona	≈ 180+ mg/L	5.6 ppt	🔴 Very Hard	mixed
Flowing Wells, Arizona	≈ 180+ mg/L	3.4 ppt	🔴 Very Hard	mixed
Oro Valley, Arizona	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Catalina Foothills, Arizona	≈ 120–179 mg/L	5.8 ppt	🟠 Hard	mixed
Tucson, Arizona	≈ 180+ mg/L	4 ppt	🔴 Very Hard	groundwater

National Benchmark

How Casas Adobes compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Casas Adobes	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Casas Adobes's Water Unique?

Local geology and source profile

Source: MixedTDS: 1274.4 mg/LpH: 8.5

Casas Adobes in Pima County, Arizona is served by Metro Water Co-Casas Adobes #3, a public water system. The utility draws from a combination of groundwater and surface water sources typical of the Tucson metropolitan region. The service area encompasses the unincorporated community of Casas Adobes north of Tucson, relying on wells and potentially supplemental surface water from regional sources managed by Pima County water authorities.

The Casas Adobes water supply originates from the Santa Cruz Basin aquifer system, which underlies much of Pima County. This aquifer is composed of Quaternary alluvial deposits overlying older Tertiary volcanic and sedimentary rock formations. The Basin and Range topography and arid desert conditions naturally produce mineral-rich groundwater, with calcium and magnesium ions leached from limestone, dolomite, and other carbonate-bearing formations accumulating in the water to create a very hard supply typical of southern Arizona.

Casas Adobes residents receive very hard water, causing noticeable scale buildup on fixtures, reduced soap lathering, and potential plumbing complications over time. Water heaters, dishwashers, and washing machines are particularly vulnerable to mineral deposits that reduce efficiency and lifespan. Homeowners are strongly advised to install water softening systems or reverse osmosis treatment to mitigate scale formation and protect plumbing infrastructure. Official water quality data for Metro Water Co-Casas Adobes #3 is limited in public sources; residents should consult the utility directly at 520-837-2430 or request the most recent Consumer Confidence Report for pH, lead and copper compliance, and disinfection byproduct data.

Geology & Source: Santa Cruz Basin aquifer, Pima County; Quaternary alluvial deposits overlying Tertiary volcanic and sedimentary formations — Basin and Range desert geology leaches calcium and magnesium from limestone and dolomite, producing very hard supply

Other Arizona Water Reports

Flowing Wells

≈ 180+ mg/L

🔴 Very Hard

Oro Valley

≈ 120–179 mg/L

🟠 Hard

Catalina Foothills

≈ 120–179 mg/L

🟠 Hard

Tucson

≈ 180+ mg/L

🔴 Very Hard

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Frequently Asked Questions

Is Casas Adobes's water safe to drink?

Yes. Casas Adobes's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Casas Adobes?

At ≈ 180+ mg/L (Very Hard), Casas Adobes's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 45%.

How does Casas Adobes compare to the USA average?

The USA national average is 151 mg/L. Casas Adobes (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Casas Adobes is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.