LOS ANGELES WATER GUIDE
Know your water.
Choose with context.
Local water information helps you ask better questions before buying a home treatment system.
OFFICIAL SOURCE / PUBLISHED 2025
What the 2025 LADWP report says
LADWP’s 2025 Drinking Water Public Health Goals Report covers 2022–2024. It reports compliance with enforceable drinking-water standards. Nine regulated substances were detected above a state Public Health Goal or a federal Maximum Contaminant Level Goal.
These health goals are non-enforceable benchmarks. Exceeding a goal is different from exceeding a legal drinking-water limit. See the executive summary on page 7 and the source-level results on page 24.
The report describes LADWP’s supplies, not a test of your tap or every Greater Los Angeles water supplier. Your supplier’s current annual report and property-specific testing are the right starting points for choosing equipment.
Start with your supplier’s report
Los Angeles properties do not all receive the same source water. Check your bill to identify your supplier, then find its current drinking-water quality report. A utility report describes the public supply; property-specific testing can help answer questions about water at your tap.
The Los Angeles Department of Water and Power (LADWP) reports that its delivered water meets state and federal drinking-water standards. Home treatment may address taste, odor, hardness, or a specific concern at the property. Avoid assuming that a filter is necessary for every household.
Hard water in Los Angeles
LADWP explains that water hardness varies with its supply sources. A water softener targets hardness minerals; a conventional carbon filter serves a different purpose. If scale is your concern, measure hardness at the property before sizing a system.
Taste and odor
Describe when you notice the issue and which taps are affected. Ask your supplier about a persistent or sudden change. Treatment media should be selected for the water supply and the exact substance or characteristic the equipment is designed to reduce.
Drinking water and reverse osmosis
Point-of-use reverse osmosis treats water at a single fixture. It produces a treated stream and a reject stream, so efficiency belongs in the comparison. The United States Environmental Protection Agency (EPA) explains how these systems work and provides WaterSense information.
Check the exact model’s certification and performance sheet for any reduction claim. A broad label such as “water purifier” does not describe every substance the product can reduce.
What a basic meter can tell you
A total dissolved solids meter estimates dissolved material. It does not identify individual contaminants, and its reading alone does not establish water safety. If your concern is a particular substance, ask about an appropriate laboratory test.
Bring the information together
Keep your supplier report, test results, and photos of the installation area together. Note whether the issue affects the entire home or a single tap. Then compare systems with documentation for the concern you have.
LET’S START WITH YOUR WATER
A clearer plan for
your home’s water.
Serving homes across Los Angeles and Greater LA.