ZipCheckup grade for 86011: C.

A mixed picture - some signals here are worth your attention.

Your top priority: use a filter certified to reduce PFAS; check which ones. Check your ZIP → EPA PFAS info

Water Quality Report

Flagstaff, AZ (86011): PFAS Detected in Mapped Water Systems - 67/100

EPA data for City of Flagstaff

PFAS Detected

EPA records for the water systems mapped to 86011 in Flagstaff, AZ contain 65 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 0 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources

Latest air quality, EPA records and weather alerts Current data temporarily unavailable

Current EPA violation data unavailable

Safety Score

C 67/100

Water Quality Concerns 65 non-health-based violation records in EPA data

Lead Risk Below action level 0.0036 mg/L, 90th percentile, sample period ending 2023-12-31

NFIP Claim History N/A

Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

Water EPA records for water systems mapped to this ZIP show 65 violations (non-health) (since 2021).
Lead The reported 90th-percentile lead result of 0.0036 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
Radon EPA Zone 2 - county-level radon potential, not a home measurement.

Contaminant Summary

Violations on record (not health-based)

65 violations PFAS detected

Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record Consumer Confidence Report: source date or period is not present in ZipCheckup's accepted source record

ZIP-level Home Safety model score: 67 / 100

Bottom 35% of U.S. ZIP codes

Water System

79,796

People Served

Health Violations (since 2021)

Surface water

Water Source

0.0036 mg/L

Reported Lead Result1.6× the national median for this measure

Zone 2

County Radon Potential · Moderate

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Safety monitoring for 86011 in Flagstaff produces 1 high-priority finding and no critical-tier conditions across all datasets reviewed.

PFAS Detected in Water Supply HIGH

PFAS ("forever chemicals") have been detected in water systems serving this ZIP code. Highest level: 0.0061 µg/L.

What to do: Consider a water filter rated for PFAS reduction (NSF/ANSI 53 or 58). See PFAS Contamination below ↓ ↓

Score Breakdown

Overall Home Safety Score: 67/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance

0/100

Observed

PFAS MCL screen

100/100

Observed

EPA radon zone

50/100

Observed

Annual EPA AirData AQI

100/100

Observed

Required domains

Drinking water

50/100

Indoor environment

50/100

Outdoor environment

100/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (8) HIGH

Your Water System

ZIP code 86011 in Flagstaff, Arizona is mapped to the water system City of Flagstaff (EPA ID: AZ0403008). This system provides water to approximately 79,796 people from surface water sources.

Other Water Quality Reports in Arizona

85001 (Phoenix)
85002 (Phoenix)
85003 (Phoenix) - 3 violations recorded for mapped water systems
85004 (Phoenix) - 3 violations recorded for mapped water systems
85005 (Phoenix)
85006 (Phoenix) - 3 violations recorded for mapped water systems
85007 (Phoenix) - 3 violations recorded for mapped water systems
85008 (Phoenix) - 3 violations recorded for mapped water systems
85009 (Phoenix) - 3 violations recorded for mapped water systems
85010 (Phoenix)
85011 (Phoenix)
85012 (Phoenix) - 3 violations recorded for mapped water systems
85013 (Phoenix) - 3 violations recorded for mapped water systems
85014 (Phoenix) - 3 violations recorded for mapped water systems
85015 (Phoenix) - 3 violations recorded for mapped water systems
85016 (Phoenix) - 3 violations recorded for mapped water systems
85017 (Phoenix) - 3 violations recorded for mapped water systems
85018 (Phoenix) - 8 violations recorded for mapped water systems
85019 (Phoenix) - 3 violations recorded for mapped water systems
85020 (Phoenix) - 3 violations recorded for mapped water systems

Nearby Water Quality Reports

86002 (Flagstaff) - <1 mi
86003 (Flagstaff) - <1 mi
86001 (Flagstaff) - 1 mi - 88 violations recorded for mapped water systems
86005 (Flagstaff) - 3 mi - 94 violations recorded for mapped water systems
86004 (Flagstaff) - 5 mi - 67 violations recorded for mapped water systems
86015 (Bellemont) - 11 mi
86018 (Parks) - 17 mi
86017 (Munds Park) - 18 mi
86038 (Mormon Lake) - 23 mi
86339 (Sedona) - 24 mi

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Flagstaff (AZ0403008) on EPA.gov.

3 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

PFAS Contamination Detected

PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 86011.

Detected compounds: PFBA.

Highest measured level: 0.0061 µg/L

Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.

Learn about PFAS risks → Find a PFAS filter →

📊 EPA UCMR5 · View source →

Environmental Hazards (10) CRITICAL

Home & Infrastructure (7) OK

Cost & Community (6) OK

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Frequently Asked Questions

Is the tap water in 86011 safe to drink?

EPA SDWIS records 65 violations since 2021 across the water systems mapped to ZIP 86011 (primary system: City of Flagstaff), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 86011's water come from?

The recorded water source for City of Flagstaff, a system mapped to ZIP code 86011, is Surface water. This system serves approximately 79,796 people.

How does Flagstaff water compare to the national average?

Flagstaff's Home Safety Score ranks lower than 65% of U.S. ZIP codes, and lower than 60% of ZIP codes within Arizona.

How can I get my water tested in Flagstaff?

If City of Flagstaff supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

Is lead a concern in 86011 tap water?

The Lead and Copper Rule record selected for 86011 reports a 90th-percentile lead result of 0.0036 mg/L for a water system mapped to this ZIP (record date 2023-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.

What is the radon risk for 86011?

86011 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Coconino County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

Are there PFAS (forever chemicals) in 86011's water?

Yes, PFAS have been detected in samples from water systems mapped to 86011. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.

How to cite this page

APA

ZipCheckup. (2026). Flagstaff, AZ (86011): PFAS Detected in Mapped Water Systems - 67/100. https://zipcheckup.com/report/86011/

BibTeX

@misc{zipcheckup-report-86011,
  author = {{ZipCheckup}},
  title  = {{Flagstaff, AZ (86011): PFAS Detected in Mapped Water Systems - 67/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/86011/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 86011

ZIP Code	City, State	Distance	Grade	Violations
86002	Flagstaff, AZ	<1 mi	N/A	0
86003	Flagstaff, AZ	<1 mi	N/A	0
86001	Flagstaff, AZ	1.0 mi	C	88
86005	Flagstaff, AZ	3.4 mi	C	94
86004	Flagstaff, AZ	4.8 mi	C	67
86015	Bellemont, AZ	10.7 mi	N/A	0
86018	Parks, AZ	17.3 mi	N/A	0
86017	Munds Park, AZ	17.8 mi	N/A	0
86038	Mormon Lake, AZ	22.7 mi	N/A	0
86339	Sedona, AZ	23.5 mi	N/A	0