Arsenic above the legal limit in the period starting January 2026.
Serves about 3,145 people (1,883 connections) with surface water from its own intake.
From EPA's record for AZ0403026. PurityMap is independent of City of Williams.
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7 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From January 2026 | Arsenic | 0.02 mg/L | 0.010 mg/L | Archived |
| From October 2025 | Arsenic | 0.019 mg/L | 0.010 mg/L | Archived |
| From May 2023 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From April 2023 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From October 2022 | Carbon, total | 0.88 RATIO | TT | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From July 2022 | Carbon, total | 1.12 RATIO | TT | Resolved |
| From January 2017 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →City of Williams's phone number on EPA record is 928-635-4451. Its mailing address is 113 S. First Street, ATT: D. Dent, WILLIAMS, AZ 86046.
According to EPA's record, City of Williams uses surface water from its own intake.
EPA's record shows 7 health-based violations for City of Williams in the 10 years to July 9, 2026. Arsenic was above the legal limit in the period starting January 2026. EPA also lists 36 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in City of Williams's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for City of Williams. Its phone number on EPA record is 928-635-4451. Its mailing address on EPA record is 113 S. First Street, ATT: D. Dent, WILLIAMS, AZ 86046. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.