City of Monterey Park Water Dept. water quality
Monterey Park, CA · serves 61,096 people (13,361 connections) · Groundwater · Local government · EPA ID CA1910092
Data: U.S. EPA · How we read the data · How we check it
Buys water from San Gabriel Valley Water Company – El Monte. Treated water bought from another system can carry that system's contaminants.
Summary
An unresolved health-based violation.
Is it an emergency? No: these findings are about longer-term exposure, 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
- Detected, below limit2 of 29 PFAS found at least once. All averages below the federal limits.
- 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 2024. Your home's pipes can make yours higher.
- Violations
- 1 unresolved1 health-based violation since 2016, most recently Oct 2024.
- 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 City of Monterey Park Water Dept.'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) 307-1293. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 1 entry point tested Sep 2024 to Mar 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 Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| 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) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Detected, below limit Guideline 6,000 ppt | 7.3 ppt |
| PFHxA Not detected Guideline 3,000 ppt | – |
| PFPeA Detected, no limit | 2.5 ppt |
29 PFAS tested, 2 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
Not detected in 2 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jan 2022 – Dec 2024). Below action level
Highest since 2016: 0.71 ppb (Dec 2020).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2022 – Dec 2024 | 0 ppb |
| Jan 2019 – Dec 2021 | 0 ppb |
| Jan 2018 – Dec 2020 | 0.71 ppb |
Earlier results (9)
| Jan 2016 – Dec 2018 | 0 ppb |
| Jan 2013 – Dec 2015 | 0 ppb |
| Jan 2010 – Dec 2012 | 0 ppb |
| Jan 2007 – Dec 2009 | 0 ppb |
| Jan 2006 – Dec 2006 | 5 ppb |
| Jan 2004 – Dec 2006 | 0 ppb |
| Jan 2003 – Dec 2005 | 5 ppb |
| Jan 2003 – Dec 2003 | 5 ppb |
| Jan 2001 – Dec 2003 | 0 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
| When | What happened |
|---|---|
| Oct 2024 | The system did not publish the required inventory of lead service lines (due October 2024). It says nothing about lead levels in the water. EPA record: Lead and copper rule revisions · LSL Inventory Unaddressed |
1 unresolved monitoring or reporting violation: Lead and copper rule revisions.
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 1.7 ppb | 300 ppb |
| Chromium-6 | 4.5 ppb | – |
| Molybdenum | 7.7 ppb | 40 ppb |
| Strontium | 0.57 ppm | 1.5 ppm |
| 1,4-Dioxane | 0.84 ppb | 0.35 ppb |
| Chlorate | 98 ppb | 210 ppb |
| Vanadium | 4.8 ppb | 21 ppb |
Where it serves
ZIP codes the system reported serving: 91754, 91755
Nearby utilities
- City of Alhambra Alhambra · 2 mi
- California Water Service – East Los Angeles Montebello · 3 mi · PFAS above limit
- City of Commerce Water Dept. Montebello · 3 mi · PFAS above limit
- Montebello Land & Water Company Montebello · 3 mi · PFAS above limit
- South Montebello Irrigation District Montebello · 3 mi · PFAS above limit
- City of Pico Rivera Water Dept. Pico Rivera · 5 mi · PFAS above limit
Questions
Is City of Monterey Park Water Dept. water safe to drink?
City of Monterey Park Water Dept. has 1 unresolved health-based violation on record. EPA testing found no PFAS above the federal limits. 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 City of Monterey Park Water Dept. water have PFAS?
Yes. EPA's 2023–2025 testing of City of Monterey Park Water Dept. found 2 PFAS at least once. None of the averages were above the federal limits.
What is the lead level in City of Monterey Park Water Dept. water?
The most recent 90th-percentile lead result for City of Monterey Park Water Dept. is 0 ppb, for the period ending Dec 2024. 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 CA1910092: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID CA1910092).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask City of Monterey Park Water Dept. at (626) 307-1293, 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.