Flagstaff, AZ: PFAS Found in Water - Home Safety 67/100
6 ZIP codes · 8 water systems · Updated
ZipCheckup grade for Flagstaff: C.
A mixed picture - some signals here are worth your attention.
Your top priority: match a filter's certification to the violations (5 health-based violations). NSF certified filters →
Documented records place Flagstaff, AZ in the middle grade tier.
How Flagstaff Compares
Data: EPA SDWIS
What You Should Know About Flagstaff Water
- Your city's water systems recorded 112 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0036 mg/L.
- Homes built before 1986: 37% - older plumbing may contain lead solder.
- Estimated remediation: $800 per household.
- Health risk index (ZipCheckup composite of CDC data): 10.52.
Who Supplies Your Water in Flagstaff
3 systems shown for Flagstaff, AZ, from 8 on the federal list.
- C
- C
- C
Overview
We track home safety data for 6 ZIP codes in Flagstaff, Arizona, covering 8 community water systems serving approximately 95,135 people. The EPA snapshots used for this build directly map water systems to 4 of 6 ZIP codes.
4 of 4 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. 5 health-based violations appear in the available health breakdown.
Home Safety Score
Average Home Safety Score for Flagstaff: C (67/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Flagstaff water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0036 mg/L (EPA action level: 0.015 mg/L)
- 0 of 4 ZIP codes with known status exceed the EPA lead action level
Radon Risk
6 of 6 ZIP records with known zones are in EPA Radon Zone 2.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Revised Total Coliform Rule | Microbiological | 24 | 4 |
| Consumer Confidence Rule | Reporting | 20 | 4 |
| Total organic carbon | Disinfection Byproducts | 15 | 4 |
| Public Notice Rule | Reporting | 11 | 2 |
| Dichloromethane | Organic | 10 | 4 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 86005 | C | 94 | 3 | City of Flagstaff |
| 86001 | C | 88 | 3 | City of Flagstaff |
| 86004 | C | 67 | 0 | City of Flagstaff |
| 86011 | C | 65 | 0 | City of Flagstaff |
All ZIP Codes in Flagstaff
- 86001 [C] - 88 violations ⚠
- 86002
- 86003
- 86004 [C] - 67 violations
- 86005 [C] - 94 violations ⚠
- 86011 [C] - 65 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Flagstaff
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Flagstaff Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Flagstaff
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Over the decades, Flagstaff accumulated housing from multiple construction periods. The median build year of 1995 can be read against 1986, when lead solder in plumbing became federally prohibited - a regulatory line, not a safety line, and individual homes on either side of it can have different plumbing.
Most homes in Flagstaff were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Flagstaff Homeowners
Measured against the median home value, the estimated cost of fixing the issues flagged for Flagstaff lands in the lowest of the three tiers this page uses.
Estimated remediation costs in Flagstaff can be compared with local home values. The $450–$1,550 estimated range can be set against the median property value; actual costs vary by home. Home values are 82% above the Arizona average.
Lead Exposure Risk for Children in Flagstaff
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Flagstaff
Historical NFIP data for Flagstaff contains 144 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $21,057. Among ZIP codes with claim records, 33% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The $800 remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
What You Can Do in Flagstaff
- Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
- Install a certified water filter. For Revised Total Coliform Rule, listed in the water-quality records for Flagstaff: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
- Check your home's plumbing. With 37% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Flagstaff, AZ