Pinal County, Arizona has about 513,862 residents (Census 2024 estimate) and 64 community water systems in EPA records. The largest local system is Arizona Water Co - Pinal Valley, serving about 134,432 people from groundwater.
! 2 of 6 largest systems with health-based violationsPFAS detected at 2 of 6 sampled systemsHardness 15.2 gpg (low confidence)
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
How hard is Pinal County water?
Arizona Water Co - Pinal ValleyEstimate: untreated local water, not your tap · Low confidence
15.2 gpg(260 mg/L), very hard
Pinal County: median of 3,771 results from 1102 monitoring sites (streams and wells). Utilities may blend or treat water, so your tap can differ.
County estimates: Hard Water Map (hardwatermap.com), CC BY 4.0, derived from the USGS/EPA Water Quality Portal; file generated 2026-07-22. License
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
Softener size at 15.2 gpg
For a 3-person home using 57 gallons per person per day and regenerating weekly, you'd remove about 18,194 grains between regenerations. Suggested size: 24,000 grain. This uses a low-confidence county estimate, so confirm with a test first.
Estimate only. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
The 6 biggest of 64 community water systems on EPA records for this county. Service areas don't follow county lines; your water bill names your provider.
Arizona Water Co - Pinal Valley
AZ0411009 · serves about 134,432 people · Groundwater
✓ No health-based violations✓ Lead below detectionPFAS detected (6 types)
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2023-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
PFBS: highest sample 91.1 ppt (6 of 20 samples); no individual limit; counted in EPA's PFAS mixture (hazard index) limit
PFPeA: highest sample 20.8 ppt (5 of 20 samples); no federal limit
PFBA: highest sample 19.9 ppt (4 of 20 samples); no federal limit
PFHxA: highest sample 18.6 ppt (5 of 20 samples); no federal limit
PFHpA: highest sample 9.4 ppt (4 of 20 samples); no federal limit
PFHxS: highest sample 6.1 ppt (4 of 20 samples); federal limit 10.0 ppt as a running annual average, also counted in EPA's PFAS mixture (hazard index) limit (currently in effect; EPA has proposed removing it)
AZ0411128 · serves about 87,435 people · Groundwater
✓ No health-based violations✓ Lead below detection✓ No PFAS detected
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2022-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
AZ0411131 · serves about 84,000 people · Groundwater
! 1 health-based violation✓ Lead below detection✓ No PFAS detected
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2022-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
AZ0411004 · serves about 62,055 people · Groundwater
✓ No health-based violations✓ Lead below detection✓ No PFAS detected
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2023-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
AZ0411117 · serves about 18,132 people · Groundwater
✓ No health-based violations✓ Lead below detectionPFAS detected (2 types)
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2022-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
PFPeA: highest sample 6.5 ppt (2 of 26 samples); no federal limit
PFHxA: highest sample 4.1 ppt (2 of 26 samples); no federal limit
AZ0411039 · serves about 15,610 people · Surface water
! 2 health-based violations✓ Lead below detection✓ No PFAS detected
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2023-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
A PFAS detection is not a violation. Federal limits (4 ppt for PFOA and PFOS) apply to running annual averages, with compliance required by 2029. In May 2026 EPA proposed extending the PFOA/PFOS deadline to 2031 and removing other PFAS limits; not final as of 2026-10-21.
Test your own tap
These are public records for whole systems. Your home's pipes, fixtures and any private well can change what you drink. A certified lab test or a hardness test strip gives you your own numbers. Then use our PFAS and lead filter selector to see which certifications to look for.
Common questions about Pinal County water
Is tap water in Pinal County safe to drink?
2 of the 6 largest systems here have at least one health-based violation in EPA records since October 2021 (see each system below for status). Arizona Water Co - Pinal Valley's most recent lead 90th percentile was below the lab detection limit (2023), below the 15 ppb action level. Public records can't guarantee what comes out of your tap, especially with older plumbing, so a home test is the surest check.
How hard is the water in Pinal County?
There's no published utility figure in our data, but untreated local stream and well samples in Pinal County have a median of about 15.2 grains per gallon (260 mg/L, very hard). That's a low-confidence estimate of source water, not your tap, so test before you buy equipment. For a 3-person home at 15.2 gpg, our softener calculator suggests a 24,000 grain unit as a starting point.
Is there PFAS in Pinal County water?
2 of the 6 sampled systems listed here detected at least one PFAS in EPA's UCMR 5 testing. A detection isn't a violation: federal PFAS limits apply to running annual averages starting in 2029.
Which water system serves my address in Pinal County?
Most homes are served by Arizona Water Co - Pinal Valley or one of the other systems listed on this page, but service areas don't follow county lines. Your water bill names your provider, and its annual Consumer Confidence Report has the full test results.
Data as of October 21, 2026. Figures are copied from public records and combined with our own calculations; they can be out of date or wrong. Tapped Out isn't affiliated with any utility or the EPA. Written and reviewed by the Tapped Out team. How we calculate · All sources.