The Los Angeles-City Department of Water & Power supplies drinking water to over 3.8 million people through more than 700,000 connections in Los Angeles, Los Angeles County. According to the EPA's public water system record for this system (CA1910067), there were two health-based violations on record among other compliance observations. The source of water is surface water, and various treatment processes are in place. This record reflects the system-wide monitoring and compliance, not the condition of any single household's water supply.
If You Leave Safe Drinking Water Problems Untreated for Years
When issues flagged in a public water system record persist without appropriate response or mitigation, over time, residents may experience impacts including inconsistent water quality or potential exposure to contaminants at levels that might affect health. However, the presence of violations in the system’s record does not confirm unsafe water at every tap but indicates that system operators must take corrective actions to maintain water safety.
If You Obtain a Certified Laboratory Test for Your Tap Water and Need to Interpret It
A certified laboratory test for substances governed by safe drinking water standards will report concentrations of contaminants like lead or others of concern. For example, the system's 2023 lead 90th percentile result was 0.0039 mg/L, reflecting distribution system sampling results rather than raw source water. Understanding such results requires comparing them against regulatory thresholds and considering the sample location and plumbing conditions. To know your household water quality, you need a test tailored to your tap water, performed by a qualified lab.
If You Observe Seasonal or Multi-Year Variation According to the System Record
The public record includes data from multiple years and reflects variation due to changes in source water, treatment efficiency, and operational adjustments. The lead 90th percentile and health-based violation counts evolve over time as monitoring continues. This temporal context shows that water quality is dynamically managed but can fluctuate within regulatory frameworks. Tracking these trends can provide perspective on water quality stability and improvements.
If Your Household Experiences Symptoms That May or May Not Align with This Problem
Certain household symptoms like unusual taste, staining, or plumbing corrosion can sometimes relate to water contaminants, but many are not definitive indicators of public system violations or health risks. The system's treatment processes address multiple water quality elements, yet some effects may stem from your home's plumbing or fixtures. Differentiating symptoms associated with systemic water quality from those related to local factors requires careful evaluation and testing.
If You Seek How the Documented Treatment Technology Can Help with Safe Drinking Water
The C-Series Safe Drinking Water Filter system ships ready to configure for residential use. It is designed to reduce or neutralize contaminants commonly monitored in public water systems, complementing existing municipal treatments. While it does not replace system-level water safety measures, it offers an additional layer of protection tailored to household consumption. Considering its capabilities in light of your water test results can inform whether it meets your needs.
This page presents information from the Los Angeles-City Department of Water & Power public water system record, which covers system-wide water quality data but does not reflect individual home plumbing conditions or supply. For more detailed information, consult the EPA’s public database directly.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2023-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for LOS ANGELES-CITY, DEPT. OF WATER & POWER (CA1910067), surface water supply, serving 3875566 people: 2 health-based violations of 4 total; lead 90th percentile 0.0039 mg/L