Arsenic in Arizona well water

In Arizona, 26% of 6,628 tested private well samples exceeded the EPA limit for arsenic (10 ug/L).

Arsenic occurs naturally in New England bedrock and dissolves into well water. Long-term exposure raises the risk of bladder, lung and skin cancers, and is linked to heart disease and lower IQ in children. It has no taste or smell, so testing is the only way to know.

Check your arsenic number

Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.

Test your Arizona well for arsenic

Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.

Order the Tap Score well water test kit, from $209 Already tested? Upload the report

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Systems that remove arsenic

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For arsenic

Under-sink reverse osmosis system

under-sink or countertop, about $300

Look for NSF/ANSI 58 certification listing the contaminant you need removed.

For arsenic

Whole-house arsenic and uranium filter

whole-house, at the point of entry, about $2,500

Adsorptive iron-based media; sized to your well yield.

For arsenic

Aquasana SmartFlow reverse osmosis

under-sink or countertop, about $225

Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.

Rather have it installed and sized for your well? Book a free in-home water test with a licensed local company.

Where to get a well tested for arsenic in Arizona: certified labs, state programs and prices.

By county, from individual samples

Public monitoring samples against the EPA limit (10 ug/L); counties with at least 30 samples.

County	Above EPA limit	Samples	Detected	Median	Highest
Yavapai	45%	884	73%	8	2,300 ug/L
Yuma	43%	277	72%	6	176 ug/L
Pinal	36%	417	71%	4	264 ug/L
La Paz	34%	383	81%	7	110 ug/L
Maricopa	28%	1,154	86%	6	160 ug/L
Greenlee	27%	79	42%	0	85 ug/L
Graham	25%	330	63%	2.1	260 ug/L
Apache	21%	119	70%	1	53 ug/L
Navajo	18%	292	87%	3	79 ug/L
Mohave	17%	829	53%	0.68	300 ug/L
Pima	15%	762	44%	0	960 ug/L
Santa Cruz	15%	85	39%	0	39 ug/L
Coconino	14%	285	74%	1	90 ug/L
Cochise	12%	527	42%	0	150 ug/L
Gila	10%	205	40%	0	210 ug/L

Camp Verde-Sedona CCD, Yavapai County80% of 274
Casa Grande CCD, Pinal County70% of 47
Kaibab Plateau CCD, Coconino County67% of 43
Wellton CCD, Yuma County65% of 150
Deer Valley CCD, Maricopa County51% of 45
Ajo CCD, Pima County50% of 44
Buckeye CCD, Maricopa County47% of 297
Maricopa-Stanfield CCD, Pinal County47% of 77
Mingus Mountain CCD, Yavapai County45% of 102
Hopi CCD, Navajo County43% of 106
Cordes Lakes-Mayer CCD, Yavapai County43% of 80
Tohono O'odham Nation CCD, Pima County41% of 188
Eloy CCD, Pinal County35% of 75
Parker CCD, La Paz County34% of 383
Prescott CCD, Yavapai County31% of 237
Safford CCD, Graham County31% of 208
Coolidge CCD, Pinal County30% of 33
Pima CCD, Graham County30% of 44
Salt River CCD, Maricopa County29% of 51
Duncan CCD, Greenlee County28% of 67

Sources

Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. arsenic counts and shares are listed on each county and town page with their sources.

Analysis: Arsenic in private wells, state by state, from the same public records.