St. George, UT Water Quality (ZIP 84770)

Quick Answers

Is ZIP 84770 tap water safe to drink? No PFAS above thresholds is reported for 84770 in current EPA data. Lead risk from older plumbing is a separate question; the results below cover the regulated contaminants tested for this system.

What filter should I use in 84770? A reverse osmosis system (NSF/ANSI 58) removes 90%+ of PFAS, lead, and arsenic. For smaller households, an NSF-53 certified pitcher (Clearly Filtered, ZeroWater) works. Standard Brita cartridges are not certified for PFAS.

ZIP 84770 Water Quality Summary

The public water system serving ZIP 84770 (St. George, UT) is not currently reported as having detected PFAS in recent EPA UCMR5 testing, though other regulated contaminants appear in the data below.

Contamination Level: NONE – No PFAS detected in recent testing for the systems serving this ZIP code.

Lead in ZIP 84770 Water

EPA Lead and Copper Rule testing recorded 23 lead samples for the systems serving 84770, with a 90th-percentile high of 0.0388 mg/L (above the EPA 0.015 mg/L action level). There is no safe level of lead for children; homes built before 1986 should use a certified NSF/ANSI 53 lead filter.

EPA Violations Affecting ZIP 84770

The water systems serving 84770 have 8 health-based EPA Safe Drinking Water Act violations on record, including Gross Alpha (excl. radon & uranium), Lead & Copper Rule, Chromium. A health-based violation means a contaminant exceeded its federal limit or required treatment was not applied.

About the Data

Source: EPA UCMR5 monitoring (2023-2025), Lead and Copper Rule samples, and SDWIS violation records tied to the water system that serves 84770 in St. George, UT.

Beyond water: other exposures in St. George, UT

Drinking water is one exposure route. These are the other federal datasets that cover ZIP 84770 and Washington County, UT.

Radon risk in Washington County, UT

The EPA places Washington County, UT in Zone 2 - a moderate-risk category, with a predicted average indoor radon level between 2 and 4 pCi/L. Zone maps predict the radon potential of an area from geology and existing indoor readings - they do not describe any individual home. Radon is the leading cause of lung cancer among people who have never smoked, and the only way to know your own level is a test kit.

Lead paint risk in Washington County, UT

Census figures show 12% of homes in Washington County, UT were built before 1980, and 2% before 1950. Lead-based paint was banned for residential use in 1978, so older housing stock is the strongest available proxy for lead-paint exposure. This is a statistic about the county's housing, not a test of any particular property - if your home predates 1980, a lead swab test is the way to check.

Air quality in Washington County, UT

Modelled annual fine-particle pollution (PM2.5) for Washington County, UT averages 5.2 µg/m³, within the EPA's annual PM2.5 standard of 9 µg/m³. PM2.5 is the pollution fraction small enough to reach deep into the lungs. These are CDC modelled estimates for the county as a whole, not a reading taken at this ZIP code.