Local water dashboard
Official source aggregationRegional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Los Angeles County.
Your tap water
Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.
Hardness not yet transcribed
The official report is available below. Check its hardness table and the source or treatment zone serving you, or ask the utility for your result.
Read Official drinking water quality report hub ↗Source checked Sep 29, 2026.
At a glance
EPA quarter 2026Q2
Utility-reported hardness
Unavailable
Ask your provider or test your tap
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
1 system
Serves 3,875,566 people system-wide
Match the name on your water bill
These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.
EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.
CA1910067 · Surface water · 3,875,566 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Read Official drinking water quality report hub ↗An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
26% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
No record returned in this imported window. This is not a guarantee of tap-water safety.
Hardness meter
254
PPM as CaCO₃
Very Hard
PPM
254
GPG
14.9
Regional environmental evidence
USGS hardness classification scale
254 PPM
Parts per million
254
mg/L as CaCO₃ equivalent
Grains per gallon
14.9
1 GPG ≈ 17.1 PPM
How to use regional evidence
These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.
USGS sites used
3
Nearest site
20.3 mi
Observation range
Apr 14, 2022–Apr 14, 2022
Regional evidence confidence
Moderate
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: N LEGG LK AB WHITTIER NARROWS DAM NR MONTEBELLO CA (Lake, Reservoir, Impoundment).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.
Regional context
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Los Angeles median
254 PPM
About the same85 indexed ZIP readings · Range 192–1531.5 PPM
California median
254 PPM
About the same549 indexed ZIP readings · Range 42.6–1531.5 PPM
Evidence-first next steps
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Use the current Consumer Confidence Report for treated-water results and official notices.
Read Los Angeles Department of Water and Power’s report ↗Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.
Convert your hardness test result →Nearby indexed reports
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.