Corona Tap Water Quality Report
Corona's water has 1 contaminant above EPA MCLGs. Consider using a certified water filter for additional protection.
Other systems listed for Corona with results above guidelines: GLEN EDEN SUN CLUB (3 above guidelines), GLEN IVY HOT SPRINGS (2 above guidelines), WESTERN MWD (2 above guidelines)
People Served
157,136
Health-based violations since 2020
0
CORONA, CITY OF. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Sep 2025 · CORONA, CITY OF
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Corona Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Corona's water has 1 contaminant above EPA health-based guidelines (MCLGs), while it meets federal legal limits.
CORONA, CITY OF, Corona's water system, serves 157,136 people. 3 other systems are listed for Corona. Each system's results are listed under its own name, never added to CORONA, CITY OF's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for CORONA, CITY OF is from Sep 2025.
In EPA's 2023–2026 UCMR 5 testing, CORONA, CITY OF measured lithium at up to 55.1 µg/L, which EPA counts as above its health reference level of 10 µg/L. That level is a screening value EPA uses to decide what to study further, not a legal limit, and this result does not change this page's water-quality summary.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in California
Corona Water Service Areas
What these numbers actually mean for Corona, CA
We read Corona, CA’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 1 contaminant above EPA MCLGs and 18 contaminants with an EPA health goal detected in some samples (no level on file)
- 210 results on file
- 23 PFAS compounds on record
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What Corona's water readings can explain
Utility-reported data for Corona includes sulfate and a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Corona, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Corona? Public-water results do not apply to private wells. See Riverside County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Corona
Corona's tap water measures 9.4 grains per gallon (161.0 mg/L) — hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for 9.4 gpg water in Corona — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For California as a whole, read water softener cost in California — priced against the plumber wage published for the state.
Frequently Asked Questions About Corona Tap Water
Corona's water has 1 contaminant above EPA MCLGs. While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach CORONA, CITY OF. For a problem with your water now (discolored water, no water, low pressure, a leak), contact CORONA, CITY OF directly.
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