ZIP 91731: El Monte, CA Tap Water

ZIP 91731 is in the El Monte, CA area, most likely served by EL MONTE-CITY, WATER DEPT.. A ZIP is a postal boundary, not a service area, so confirm your supplier on your water bill.

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What the record shows · CA1910038

Test results for EL MONTE-CITY, WATER DEPT.

Results describe the water system, not a specific tap in ZIP 91731. Each bar marks the listed reference for that substance.

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above a listed reference: 1
detected, within reference or no limit: 1
aesthetic measures: 0
tested, not detected: 29

Detected · 2 results, farthest from the reference first

PFOSPerfluorooctanesulfonic acid (PFOS)
4.4ng/L
4.0 ng/L federal MCL (2024)
Above EPA's 2024 limit (one sample) · EPA UCMR 5 · 2023Evidence
PFHxSPerfluorohexanesulfonic acid (PFHxS)
3.2ng/L
10 ng/L federal MCL (2024)
Below the listed reference · EPA UCMR 5 · 2023Evidence

Aesthetic · no federal health limit

CaCO₃Water hardness

Not measured: no utility report on file. Hardness affects fixtures and appliances, not health.

Tested, not detected

Other contaminants tested

29none detected

Below each lab’s reporting limit. A result, not zero, and it covers only what was tested.

Show all 29Hide list

11Cl-PF3OUdS
4:2 FTS
6:2 FTS
8:2 FTS
9Cl-PF3ONS
ADONA
HFPO-DA (GenX)
NEtFOSAA
NFDHA
NMeFOSAA
PFBA
PFBS
PFDA
PFDoA
PFEESA
PFHpA
PFHpS
PFHxA
PFMBA
PFMPA
PFNA
PFOA
PFPeA
PFPeS
PFTA
PFTrDA
PFUnA
Lithium
Lead (90th percentile)

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One result is above its listed reference. Lead mostly enters from building plumbing, which this system-level record can’t see.

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Which water system serves ZIP 91731?

The public system on record for ZIP 91731 (El Monte, CA) is EL MONTE-CITY, WATER DEPT.. A ZIP is a postal boundary, not a service area. Confirm your supplier on your water bill.

Is the water in ZIP 91731 the same as El Monte's?

ZIP 91731 falls within the El Monte, CA area, but a ZIP code can span more than one utility. Read the serving system's own record for the results that apply to your address.

How do I find the exact water system for ZIP 91731?

Check the utility name on your water bill, or resolve it from your street address with Find My Water. The ZIP-level view lists candidate systems, not a confirmed household match.