Water system

City of Williams

Name: City of Williams drinking water quality
Creator: TapWaterZip
License: https://www.usa.gov/government-works

Arizona EPA ID AZ0403026 3,145 people Surface water

EPA name: Williams City of

What this means for you

Is it safe to drink right now?: Based on the latest EPA data, City of Williams has no unresolved health-based violations from the past year. Water that meets federal standards is generally considered safe to drink for most healthy people.
Should I use a filter?: It's worth considering. City of Williams has a D because of its violation record over the past 5 years (7 health-based), even though nothing is flagged as unresolved in the last year. A filter matched to the contaminants in its violation history is a reasonable precaution.
What kind of filter?: See matched standards and product picks.

This is general information from public EPA data, not medical advice. Lead often comes from a home’s own pipes, so only a test of your tap can tell your exposure. If you are pregnant, caring for an infant, or have a weakened immune system, ask your doctor or health department.

Summary: 7 health-based violations in the last 5 years; 20 monitoring/reporting violations; 1 not yet resolved; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2026).

EPA data snapshot 2026Q3. Grade is TapWaterZip's own score — see methods.

PFAS (“forever chemicals”), EPA UCMR 5

No UCMR 5 results on file (mostly smaller systems weren’t required to test).

Lead and copper

Lead 90th percentile8.6 ppb2026-06-30

Current action level15 ppbLCRI lowers to 10 ppb on Nov 1, 2027

Violations (last 5 years)

Began	Type	Contaminant / rule	Status
2026-06-01	Required treatment not done	Surface Water Treatment Rule	Archived
2026-05-15	Other paperwork/notice violation	Public Notice	Resolved
2026-02-01	Missed or late testing/reporting	Surface Water Treatment Rule	Archived
2026-01-01	Missed or late testing/reporting	Arsenic	Archived
2026-01-01	Missed or late testing/reporting	Lead and Copper Rule	Unaddressed
2026-01-01	Contaminant above legal limit	Arsenic	Archived
2025-12-01	Missed or late testing/reporting	Surface Water Treatment Rule	Resolved
2025-12-01	Missed or late testing/reporting	Interim Enhanced Surface Water Treatment Rule	Resolved
2025-10-01	Contaminant above legal limit	Arsenic	Archived
2025-07-01	Other paperwork/notice violation	Consumer Confidence Rule	Resolved
2025-05-01	Missed or late testing/reporting	Chlorine	Resolved
2023-10-02	Other paperwork/notice violation	Consumer Confidence Rule	Resolved
2023-05-01	Required treatment not done	Interim Enhanced Surface Water Treatment Rule	Resolved
2023-04-01	Required treatment not done	Interim Enhanced Surface Water Treatment Rule	Resolved
2023-01-31	Other paperwork/notice violation	Public Notice	Resolved
2023-01-01	Missed or late testing/reporting	CARBON, TOTAL	Resolved
2022-10-02	Other paperwork/notice violation	Consumer Confidence Rule	Resolved
2022-10-01	Required treatment not done	CARBON, TOTAL	Resolved
2022-10-01	Missed or late testing/reporting	CARBON, TOTAL	Resolved
2022-09-01	Missed or late testing/reporting	Interim Enhanced Surface Water Treatment Rule	Resolved
2022-09-01	Missed or late testing/reporting	Surface Water Treatment Rule	Resolved
2022-07-01	Required treatment not done	CARBON, TOTAL	Resolved
2022-03-01	Missed or late testing/reporting	Surface Water Treatment Rule	Resolved
2022-01-01	Missed or late testing/reporting	Interim Enhanced Surface Water Treatment Rule	Resolved
2022-01-01	Missed or late testing/reporting	Chlorine	Resolved

Filters matched to this water

FILTER PICKS

Look for filters certified (NSF, IAPMO or WQA) to these standards for the specific contaminant. Buttons open the maker’s page or an Amazon search; use “Check NSF listing” to verify a model’s claims. No affiliate links yet — grades are never sold.