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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
EPA records for MONTEREY PARK-CITY, WATER DEPT. • Updated September 2026
Grade D — based on EPA compliance records, lead testing and PFAS monitoring
MONTEREY PARK-CITY, WATER DEPT. has notable problems in EPA's records — health-based violations, elevated lead or PFAS above the federal limit. A certified filter is a reasonable precaution.
Monterey Park, CA tap water is legal to drink but grades D on EPA's records, mainly because of 1 health-based EPA violation in the last five years (1 unresolved) and low-level PFAS (PFBA, PFPeA) detected below federal limits. A certified filter matched to those findings is a reasonable precaution.
Monterey Park, CA tap water is legal to drink but grades D on EPA's records, mainly because of 1 health-based EPA violation in the last five years (1 unresolved) and low-level PFAS (PFBA, PFPeA) detected below federal limits. A certified filter matched to those findings is a reasonable precaution.
MONTEREY PARK-CITY, WATER DEPT.'s most recent Lead and Copper Rule result (2022-01-01 to 2024-12-31) was 0 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
Yes. EPA's UCMR5 sampling (2024-09-16 to 2025-03-14) detected PFBA, PFPeA, all below federal MCLs. Reverse osmosis and certified activated-carbon filters reduce PFAS.
MONTEREY PARK-CITY, WATER DEPT. has 2 violations on file since 2016: 1 health-based in the last five years (1 still unresolved) and 1 monitoring or reporting violation in that window. Monitoring violations are paperwork lapses, not measured contamination.
MONTEREY PARK-CITY, WATER DEPT. reports groundwater as its primary source and serves about 62,183 people (EPA PWSID CA1910092).
We recommend one. Check which contaminant the violations involved (table above) and choose a filter certified for it.
Compare filter options for your Monterey Park tap water
MONTEREY PARK-CITY, WATER DEPT. has 1 health-based EPA violation in the last five years.
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MONTEREY PARK-CITY, WATER DEPT. · SDWIS records since 2016 · 5-year window starts 2021-09-13
EPA records 1 health-based violation for this system in the last five years, and 1 health-based violation is still listed as unaddressed or addressed-but-not-resolved. Health-based violations mean a contaminant exceeded its Maximum Contaminant Level (MCL) or a required treatment step was not met.
| Violation | Category | Compliance period | Status |
|---|---|---|---|
| LSL InventoryLEAD AND COPPER RULE REVISIONS | Treatment technique | 2024-10-17 | Unaddressed |
| LSL ReportingLEAD AND COPPER RULE REVISIONS | Reporting | 2024-10-17 | Unaddressed |
Source: ECHO SDWA bulk download (SDWA_VIOLATIONS_ENFORCEMENT.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA Lead and Copper Rule 90th-percentile results reported by MONTEREY PARK-CITY, WATER DEPT.
Well below the 15 ppb action level. In the most recent monitoring period on file (2022-01-01 to 2024-12-31), 90% of the homes MONTEREY PARK-CITY, WATER DEPT. sampled had lead at or below 0 ppb.
EPA's action level is 15 ppb (dropping to 10 ppb under the 2024 Lead and Copper Rule Improvements). There is no safe level of lead; the 90th-percentile figure describes the system, not your tap — homes with lead service lines or pre-1986 plumbing can be higher.
| Monitoring period | Lead 90th percentile | vs 15 ppb action level |
|---|---|---|
| 2022-01-01 → 2024-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2019-01-01 → 2021-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2018-01-01 → 2020-12-31 | 0.71 ppb | Well below the 15 ppb action level |
| 2016-01-01 → 2018-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2013-01-01 → 2015-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2010-01-01 → 2012-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2007-01-01 → 2009-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2006-01-01 → 2006-12-31 | 5 ppb | Below the action level, but detectable |
| 2004-01-01 → 2006-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2003-01-01 → 2005-12-31 | 5 ppb | Below the action level, but detectable |
| 2003-01-01 → 2003-12-31 | 5 ppb | Below the action level, but detectable |
| 2001-01-01 → 2003-12-31 | 0 ppb | Well below the 15 ppb action level |
Source: ECHO SDWA bulk download (SDWA_LCR_SAMPLES.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA UCMR5 monitoring, 2024-09-16 to 2025-03-14 · 58 PFAS results at entry points to the distribution system
PFBA, PFPeA detected at low levels; no compound was at or above its federal MCL. Detections below the MCL are common in surface-water systems and are reported here exactly as EPA published them.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 0 / 2 | < 4 | 4 ppt | 4 ppt |
| PFOS | 0 / 2 | < 4 | 4 ppt | 4 ppt |
| PFHxS | 0 / 2 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 2 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 2 | < 5 | 5 ppt | 10 ppt |
| PFBS | 0 / 2 | < 3 | 3 ppt | hazard index only |
| PFBA | 2 / 2 | 7.4 | 5 ppt | hazard index only |
| PFPeA | 1 / 2 | 5 | 3 ppt | hazard index only |
“< 4 ppt” means below the laboratory reporting limit, not zero. ppt = parts per trillion (ng/L). Results are for finished water leaving the treatment plant.
What PFAS are and how to remove them → · Best filters for PFAS →
Source: UCMR5 occurrence data, EPA Data Summary July 2026 (UCMR5_All.txt)
EPA Six-Year Review 4 compliance samples for MONTEREY PARK-CITY, WATER DEPT. · finished water only · dated data, released 2024
These are the regulated-contaminant samples MONTEREY PARK-CITY, WATER DEPT. reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Every scored contaminant stayed within its Maximum Contaminant Level (MCL) and averaged below 80% of the limit. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Arsenic | 1,397670 detects | 1.816 µg/L | 9.7 µg/L | 10 µg/LMCL | Within MCL |
| Nitrate (as N) | 2,600 | 4.591 mg/L | 7.3 mg/L | 10 mg/LMCL | Within MCL |
| Total trihalomethanes (TTHM) | 13,564118 detects | 0.039 µg/L | 18 µg/L | 80 µg/LMCL (LRAA) | Within MCL |
| Haloacetic acids (HAA5) | 12442 detects | 0.539 µg/L | 3.1 µg/L | 60 µg/LMCL (LRAA) | Within MCL |
Averages count non-detects as zero. TTHM and HAA5 limits are locational running annual averages, so a single high sample is not a violation — we grade those on the average only. Lead and copper rows are individual tap samples and are shown for context; compliance (and our score) uses the 90th-percentile result above. LRAA = locational running annual average; ND = not detected.
Source: SYR4 Six-Year Review compliance monitoring data 2012–2019 (released 2024-03)
A point-of-use (under-sink) system typically runs $200-$600 installed; whole-house treatment $1,000-$3,000+ depending on flow and what has to come out. Tell us where you are and a certified water-treatment installer serving Monterey Park will follow up - no obligation.
MONTEREY PARK-CITY, WATER DEPT. · 13,590 service lines inventoried · Q2 2026 snapshot
MONTEREY PARK-CITY, WATER DEPT. reports no confirmed lead service lines, but 12,178 lines (90%) have not yet been verified, so lead cannot be ruled out for those homes. Utilities must keep investigating unknown lines under EPA's Lead and Copper Rule Improvements.
Source: EPA SDWIS Service Line Inventory (Q2 2026) · PWS ID CA1910092 · See all California lead service lines. We may earn a commission from filters and test kits, at no extra cost to you.
Groundwater systems draw from wells; naturally occurring arsenic, nitrate, radium and uranium are the readings to watch, along with PFAS near industrial or military sites.
How to test your tap water and the treatment options that actually fit Monterey Park homes
The most reliable way to know what is actually coming out of your tap is a certified mail-in lab test. City-wide EPA data (like the report above) reflects the water leaving the treatment plant, but contaminants such as lead and copper can be picked up from your own service line and household plumbing — so the water at your Monterey Park faucet can differ from the system average. A state-certified lab measures dozens of contaminants at once with results you can trust; you can also find one near you through the EPA's certified-lab list at epa.gov/dwlabcert. Hardware-store test strips are cheaper and instant, but they only screen for a few basics (chlorine, hardness, pH, and a rough lead pass/fail) and are far less accurate — treat them as a first look, not a diagnosis.
Match the treatment to what your test finds. Reverse osmosis (RO) removes the widest range of contaminants — lead, arsenic, nitrate, PFAS, and dissolved solids — which makes an under-sink reverse osmosis system the most thorough choice for Monterey Park households with heavy-metal or PFAS concerns. If your main issue is taste, odor, or chlorine, an activated carbon filter (pitcher, faucet, or under-sink) is simpler and cheaper and handles chlorine and many organic compounds well, though carbon alone does not remove arsenic, nitrate, or most PFAS. NSF-certified pitchers rated for lead reduction are the easiest way to start today while you decide on a permanent setup.
We may earn a commission from testing kits and filters purchased through these links, at no extra cost to you.
What Monterey Park residents measured at their own tap (ZIPs 91754, 91755). All reader results →
Reader submissions are unverified and shown separately from EPA data. They reflect one tap on one day, not the utility's compliance record.
No reader results for Monterey Park yet - yours would be the first. A hardness or TDS number from a $10 strip kit is enough to start the map.
Help build the first reader-sourced water map. Enter whatever your test strip, TDS pen or lab report shows - one number is enough.
Monterey Park ranks #157 of 163 graded California cities.
Deep-dive guides for the specific contaminants EPA data flagged in Monterey Park's water, with removal options for each.
Monterey Park, CA tap water is legal to drink but grades D on EPA's records, mainly because of 1 health-based EPA violation in the last five years (1 unresolved) and low-level PFAS (PFBA, PFPeA) detected below federal limits. A certified filter matched to those findings is a reasonable precaution.
MONTEREY PARK-CITY, WATER DEPT.'s most recent Lead and Copper Rule result (2022-01-01 to 2024-12-31) was 0 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
Yes. EPA's UCMR5 sampling (2024-09-16 to 2025-03-14) detected PFBA, PFPeA, all below federal MCLs. Reverse osmosis and certified activated-carbon filters reduce PFAS.
MONTEREY PARK-CITY, WATER DEPT. has 2 violations on file since 2016: 1 health-based in the last five years (1 still unresolved) and 1 monitoring or reporting violation in that window. Monitoring violations are paperwork lapses, not measured contamination.
MONTEREY PARK-CITY, WATER DEPT. reports groundwater as its primary source and serves about 62,183 people (EPA PWSID CA1910092).
We recommend one. Check which contaminant the violations involved (table above) and choose a filter certified for it.
MONTEREY PARK-CITY, WATER DEPT. has 1 health-based EPA violation in the last five years.
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Based on contaminants detected in your water, these resources may be helpful:
Find the right filter for your Monterey Park water quality needs:
Tap water is one piece of the picture — our sister sites cover the rest for Monterey Park, CA.
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