Water quality report

HOLLISTER RANCH ESTATES

HOLLISTER, CA · 150 people served · EPA PWSID CA3500904

The bottom line

HOLLISTER RANCH ESTATES (HOLLISTER, CA), which serves about 150 people, has recorded 1 health-based drinking-water contaminant in EPA violation records since 2016, most notably Uranium. Its most recent lead 90th-percentile sample was 0.0 ppb, within the 15 ppb federal action level. A certified water filter can reduce these at the tap — see the certified options for each below.

health contaminants on record

PFAS detected (UCMR5)

total health violations since 2016

What the testing found

Measured levels from EPA violation records, compared to the federal limit (MCL). The black line marks the legal limit.

Copper

1.38× the federal limit

Measured 1800 ppb · federal limit 1300 ppb · latest 12/31/2001 · 0 violations since 2016

Short-term: nausea/vomiting/cramps; long-term: liver/kidney damage. Leaches from copper plumbing, worse with corrosive water.

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Uranium

Over limit

Measured 23 pCi/L · federal limit 30 µg/L · latest 10/01/2016 · 4 violations since 2016

Naturally occurring radioactive metal; MCL 30 ug/L. Kidney toxicity and cancer risk. Common in western groundwater.

Lead

Not detected

Measured 0 ppb · federal limit 15 ppb · latest 12/31/2023 · 0 violations since 2016

No safe level. Damages developing brain/nervous system in children; linked to lower IQ, kidney and cardiovascular harm in adults. Usually enters water from corroding pipes/solder, not the source.

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Your recommended fix

Filters certified to clean up your water

Your water shows Copper. A reverse osmosis system handles the most of this in one unit — these three are independently certified for the most of your contaminants (not marketing claims):

Best match for your water

EcoPure

ECOP30

Covers 1 of your 1 filterable contaminant

REVERSE OSMOSIS NSF certified

$219.99

6.2¢/gal

Buy →

AFWFilters

Pentair GRO-575B

Covers 1 of your 1 filterable contaminant

REVERSE OSMOSIS NSF certified

$809

13.8¢/gal

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PUR

PDI4000Z

Covers 1 of your 1 filterable contaminant

PITCHER NSF certified

$51.57

23.0¢/gal

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Compare all certified reverse osmosis filters →

Want certainty about your tap specifically (not just the system)? A certified mail-in lab test is the gold standard — system-wide records can differ from your home's plumbing. Some links above are affiliate links — see our disclosure.

Sources & method. Contaminant levels and violations come from EPA's Safe Drinking Water Information System (health-based violations, 2016–present); PFAS from EPA UCMR5 monitoring (2023–2025). Levels shown are the highest recorded value in the violation records; a violation means the contaminant exceeded its federal limit at the system level. Your home's water can differ from the system average. Public domain data; we are not affiliated with the EPA.