No open EPA violations as of 2026-09-16.
EPA record checked 2026-10-06
From EPA's record for CA3610034. PurityMap is independent of Ontario Municipal Utilities Company.
Every community water system publishes one each year. Your water bill or the utility's website links to it.
As listed in EPA's records. Your water bill names your supplier.
Are you this utility? Correct this listing →
31 results are on record. These 5 come first: results above a listed reference, then those closest to a legal limit.
0health-based violations in the last 10 years · none open as of 2026-09-16
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit. Meeting a federal limit is a compliance fact, not a health clearance.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
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.
One email when a new sampling round is published or a result moves across its reference.
Follow this water →Its official website is ontarioca.gov, its phone number on EPA record is 909-395-2682 and its mailing address is 1425 S. BON VIEW AVE., ONTARIO, CA 91761. These details come from the system's EPA record and a check of its website.
Bills, starting service and stopping service are handled by Ontario Municipal Utilities Company on its official website, ontarioca.gov. PurityMap does not take payments.
EPA's records list Ontario Municipal Utilities Company as serving Ontario, California. Your water bill names your supplier.
PurityMap's record for Ontario Municipal Utilities Company holds results for 29 PFAS substances. 6 were detected, and none is above a federal legal limit. Each result links to its source in the city report.
No open EPA violations as of 2026-09-16: that is what EPA's record shows for Ontario Municipal Utilities Company. The record comes from EPA's SDWIS compliance database.
Ontario Municipal Utilities Company is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where Ontario Municipal Utilities Company reported something related, it's shown below.
Lead at Ontario Municipal Utilities Company: 0.6 µg/L (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.