D29/100
Williams Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 10,038 residents · Arizona
What's In Williams's Tap Water?
6
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
4
Violations (last 5yr)
0
Unresolved
2
Health-Related
TIER 3Resolved
Failed to conduct Level 1 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: May 28, 2025 – May 14, 2025Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Maximum contaminant level violation
When: April 13, 2025 – July 16, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: December 1, 2024 – December 31, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2022 – March 31, 2022Enforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
WILLIAMS CITY OF
Population Served
3,145
Water Source
Groundwater
System ID
AZ0403026
BEARIZONA
Population Served
1,423
Water Source
Groundwater
System ID
AZ0403105
GOLDEN SHORES WATER COMPANY
Population Served
3,970
Water Source
Groundwater
System ID
AZ0408024
SUNRISE VISTA UTILITIES
Population Served
1,500
Water Source
Purchased Groundwater
System ID
AZ0408133
Frequently Asked Questions About Williams Water
Is Williams tap water safe to drink?
Williams, Arizona tap water receives a grade of D (29/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 618 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Williams's water?
Of the 13 contaminants tested in Williams's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Williams have any water quality violations?
Yes, Williams has 618 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, TT. 27 of these are health-based violations, which are the most serious category.
Do I need a water filter in Williams?
Williams water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Williams's tap water come from?
Williams's drinking water is sourced from groundwater and supplied by WILLIAMS CITY OF and 3 other water system(s). The system serves approximately 10,038 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Williams's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Williams's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Williams's water compare to other cities in Arizona?
Williams's water quality score of 29/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Arizona state page to see how all cities in the state compare.
What should I do if I'm concerned about Williams's water quality?
If you have concerns about Williams's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (WILLIAMS CITY OF) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.