Mammoth, AZ: Lead Above EPA Limits — 54/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Although conditions vary by service area, Mammoth's water systems collectively show below-average compliance within AZ — health-based violations are documented throughout the city, and the overall grade reflects a pattern rather than isolated incidents.
How Mammoth Compares
Data: EPA SDWIS Last verified: 2026-06-03
Mammoth Water: The Quick Version
- Your city's water systems recorded 5 violations in the past 5 years.
- Average lead level: 0.019 mg/L — exceeds the EPA action level of 0.015 mg/L.
- Homes built before 1986: 83% — older plumbing may contain lead solder.
- Estimated remediation: $6,580 per household.
- CDC health risk index: 13.46 — above typical levels.
Water Systems Serving Mammoth
2 water utilities share the residential service territory in Mammoth, AZ — out of 2 total systems in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Mammoth, Arizona (population ~1,347), covering 2 community water systems serving approximately 11,766 people region-wide.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Mammoth: D (54/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Mammoth water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0190 mg/L (exceeds EPA action level) (EPA action level: 0.015 mg/L)
- 1 ZIP code exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 4 | 1 |
| Surface Water Treatment Rule | Treatment Technique | 4 | 1 |
| Revised Total Coliform Rule | Microbiological | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 85618 | D | 5 | 0 | Arizona Water Company - Oracle |
All ZIP Codes in Mammoth
- 85618 [D] — 5 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
Updated daily.
CDC Health Data for Mammoth
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Mammoth
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Mammoth's Housing Stock?
With 83% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
While newer cities carry lower aggregate plumbing risk from lead-era construction, Mammoth sits firmly in the older category. The median build year of 1976 indicates that more than half the housing stock was built before 1986, when lead solder was still legally used in residential copper plumbing — and a substantial portion likely predates 1970, when lead pipes were still commonly installed for service lines. These two thresholds together define the elevated plumbing risk environment that older housing cities carry, independent of what the municipal water supply delivers to the meter.
Over half of homes in Mammoth were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Mammoth: Remediation Cost in Perspective
Viewed from a financial planning lens, Mammoth sits in the high remediation-share tier — the equity impact of addressing documented issues is material, and deliberate preparation is more than a convenience here.
At 6.6% of home value, remediation costs in Mammoth represent a significant financial burden. For homes valued near the median, fixing water and safety issues could cost $4,120–$9,240. Home values here are 67% below the Arizona average.
Protecting Children from Lead in Mammoth
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Before the federal action against lead-bearing solder, that material was routinely permitted in new plumbing — and 83% of Mammoth housing dates from that earlier era. Citywide utility samples have also moved past the regulatory action level. Two independent indicators are aligned here: a majority of buildings carry pre-rule interior lines, while system-level concentrations sit beyond the federal benchmark. Households with kids or pregnant residents can find an in-home test and a certified lead-removal filter through certified retail channels.
<strong>1 ZIP code</strong> (100% of the city) exceeds the EPA lead action level of 0.015 mg/L.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Mammoth
Flood history in Mammoth spans 3 NFIP claims and 100% flood zone coverage — enough to place it in moderate-exposure territory where flood events are genuinely recurring rather than statistical outliers. That distinction matters for water quality assessment because the connection between flooding and water safety is not uniform across communities. In low-exposure areas, flooding rarely generates the conditions needed to compromise treatment or distribution infrastructure. In high-exposure areas, it can do so repeatedly. Moderate-exposure communities sit in between: flood events occur with enough frequency to make periodic infrastructure stress a reasonable concern, particularly for private well owners and residents in lower-elevation FEMA-designated zones.
Mammoth has a moderate flood history with 3 FEMA claims averaging $7,583 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
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. Flood damage can add significantly to the estimated <strong>$6,580</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Mammoth
- Test your water at home. City-level data shows averages — your tap may differ. Lead testing is especially recommended given the area's lead levels.
- Install a certified water filter. Filters rated for Total Trihalomethanes (TTHM) can reduce the most common contaminant found in Mammoth's water.
- Check your home's plumbing. With 83% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Mammoth, AZ