Suburban Water Systems-la Mirada water quality
La Mirada, CA · serves 57,240 people (15,231 connections) · Purchased surface water · Private · EPA ID CA1910059
Data: U.S. EPA · How we read the data · How we check it
Buys water from Suburban Water Systems-Whittier, Metropolitan Water District of SO. Cal.. Treated water bought from another system can carry that system's contaminants.
Summary
PFAS above the 2024 federal limits. Systems have until 2029 to meet the PFAS limits.
Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility ever issues a boil-water or do-not-drink notice, follow it.
- PFAS
- Above limitPFOA, PFOS above the federal limit in EPA's 2023–2025 testing (PFOA 5.75 ppt vs a limit of 4 ppt, PFOS 12.3 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lithium
- Above screening levelHighest result 17 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level0 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2025. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Pregnant, or mixing baby formula with tap water? Babies drink more water for their size, so PFAS exposure matters more for them. Consider bottled water or a filter certified for PFAS for formula, and ask your doctor. Health effects.
- To lower your PFAS exposure now, a home filter certified for PFAS reduction works (reverse osmosis, or activated carbon certified to NSF/ANSI 53 or 58). Filters for these results.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Suburban Water Systems-la Mirada's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (626) 430-4275. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 3 entry points tested Dec 2024 to Aug 2025. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Above limit Limit 4 ppt | 5.75 ppt 1.44× the limit |
| PFOS Above limit Limit 4 ppt | 12.3 ppt 3.09× the limit |
| PFHxS Detected, below limit Limit 10 ppt | 1.9 ppt 19% of the limit |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Detected, below limit Limit 1 | 0.19 |
| PFBS Detected, below limit Guideline 2,000 ppt | 3.6 ppt |
| PFBA Detected, below limit Guideline 6,000 ppt | 8.4 ppt |
| PFHxA Not detected Guideline 3,000 ppt | – |
| PFPeA Detected, no limit | 1.75 ppt |
For context: the PFOA average is higher than at 90% of the California systems EPA tested and the PFOS average is higher than at 91% of the California systems EPA tested.
29 PFAS tested, 6 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 2 of 6 samples. Highest result 17 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jan 2023 – Dec 2025). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2023 – Dec 2025 | 0 ppb |
| Jan 2020 – Dec 2022 | 0 ppb |
| Jan 2017 – Dec 2019 | 0 ppb |
Earlier results (9)
| Jan 2014 – Dec 2016 | 0 ppb |
| Jan 2011 – Dec 2013 | 1.3 ppb |
| Jan 2008 – Dec 2010 | 1.4 ppb |
| Jan 2005 – Dec 2007 | 3 ppb |
| Jan 2004 – Dec 2004 | 3 ppb |
| Jan 2002 – Dec 2004 | 3 ppb |
| Jan 2003 – Dec 2003 | 5 ppb |
| Jan 2001 – Dec 2003 | 1 ppb |
| Jan 2002 – Dec 2002 | 5 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
No violations on record in EPA's Safe Drinking Water Information System.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 45 ppb | 300 ppb |
| Vanadium | 3.2 ppb | 21 ppb |
| Molybdenum | 41 ppb | 40 ppb |
| Chromium-6 | 2.5 ppb | – |
| Strontium | 0.65 ppm | 1.5 ppm |
| Cobalt | 2.4 ppb | 70 ppb |
| 1,4-Dioxane | 0.49 ppb | 0.35 ppb |
| Chlorate | 240 ppb | 210 ppb |
Where it serves
La Mirada, Fullerton, Whittier, Buena Park, Santa Fe Springs, South Whittier
ZIP codes the system reported serving: 90604, 90605, 90620, 90621, 90638, 90639, 90670, 92833
Nearby utilities
- City of Buena Park Buena Park · 3 mi · PFAS above limit
- City of la Habra La Habra · 4 mi
- La Habra Heights County Water District La Habra · 4 mi · PFAS above limit
- City of Santa Fe Springs Water Dept. Santa Fe Springs · 4 mi · PFAS above limit
- City of Norwalk Water Dept. Norwalk · 4 mi · PFAS above limit
- Liberty Utilities – Bellflower-Norwalk Norwalk · 4 mi · PFAS above limit
Questions
Is Suburban Water Systems-la Mirada water safe to drink?
Suburban Water Systems-la Mirada has no health-based violations since 2016. EPA testing found PFAS above the 2024 federal limits, which systems must meet by 2029. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Suburban Water Systems-la Mirada water have PFAS?
Yes. EPA's 2023–2025 testing of Suburban Water Systems-la Mirada found 6 PFAS at least once. The highest entry-point averages were above the federal limit for PFOA and PFOS: PFOA 5.75 ppt, PFOS 12.3 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in Suburban Water Systems-la Mirada water?
The most recent 90th-percentile lead result for Suburban Water Systems-la Mirada is 0 ppb, for the period ending Dec 2025. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for CA1910059: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID CA1910059).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Suburban Water Systems-la Mirada at (626) 430-4275, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.