Is Hawthorne, CA tap water safe?
Supplied by Golden State Water Company – Southwest · serves 277,740 people (52,644 connections) · Purchased surface water · EPA ID CA1910155
Data: U.S. EPA · How we read the data · How we check it
Most of Hawthorne gets its water from Golden State Water Company – Southwest. Parts of the city are served by a smaller system: Hawthorne-City Water Dept. (46,039 people). Your water bill names your system.
Buys water from Liberty Utilities – Compton, City of Inglewood Water Dept., Hawthorne-City Water Dept., Metropolitan Water District of SO. Cal., City of Los Angeles Dept. of Water & Power, California Water Service – Dominguez. Treated water bought from another system can carry that system's contaminants.
Summary
No federal limits exceeded in EPA data.
- PFAS
- Not detectedNone of 29 PFAS found above EPA's reporting limits in 18 samples (2023–2025).
- Lithium
- Above screening levelHighest result 51.3 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level1.7 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period Jan 2024 – now, still in progress (results reported so far). Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Golden State Water Company – Southwest's 2026 water quality report (PDF) (Consumer Confidence Report, from the utility). It lists every regulated contaminant tested, including ones not on this page. Questions: (310) 263-4141.
PFAS (“forever chemicals”)
EPA UCMR 5: 8 entry points tested Jun 2024 to Mar 2025. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 0 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 4 of 18 samples. Highest result 51.3 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 1.7 ppb lead (Jan 2024 – now (in progress)). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2024 – now (in progress) | 1.7 ppb |
| Jan 2020 – Dec 2022 | 0 ppb |
| Jan 2017 – Dec 2019 | 0 ppb |
Earlier results (9)
| Jan 2014 – Dec 2016 | 1 ppb |
| Jan 2011 – Dec 2013 | 0 ppb |
| Jan 2008 – Dec 2010 | 1 ppb |
| Jan 2005 – Dec 2007 | 2 ppb |
| Jan 2004 – Dec 2004 | 5 ppb |
| Jan 2002 – Dec 2004 | 5 ppb |
| Jan 2001 – Dec 2003 | 5 ppb |
| Jan 2001 – Dec 2001 | 5 ppb |
| Jan 1999 – Dec 2001 | 5 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 46 ppb | 300 ppb |
| Vanadium | 3.8 ppb | 21 ppb |
| Strontium | 0.95 ppm | 1.5 ppm |
| Chlorate | 580 ppb | 210 ppb |
| Molybdenum | 11 ppb | 40 ppb |
| Chromium-6 | 0.2 ppb | – |
Where it serves
Hawthorne, Carson, Compton, Inglewood, Redondo Beach, Gardena, El Segundo, West Rancho Dominguez, Lawndale, Lennox
ZIP codes the system reported serving: 90017, 90030, 90044, 90045, 90047, 90059, 90061, 90220, 90222, 90245, 90247, 90248, 90249, 90250, 90260, 90261, 90278, 90301, 90303, 90304, 90745, 90746
Nearby utilities
- City of Inglewood Water Dept. Inglewood · 3 mi
- California Water Service – Dominguez Torrance · 6 mi
- California Water Service – Hermosa/Redondo Torrance · 6 mi
- California Water Service – Palos Verdes Torrance · 6 mi
- City of Torrance Water Dept. Torrance · 6 mi
- Golden State Water Company – Florence/Graham Florence-Graham · 7 mi
Questions
Is Hawthorne tap water safe to drink?
Most of Hawthorne gets its water from Golden State Water Company – Southwest. Golden State Water Company – Southwest has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Hawthorne water have PFAS?
EPA tested Golden State Water Company – Southwest for 29 PFAS between Jun 2024 and Mar 2025 and none were detected above the reporting limits (about 2 to 20 ppt depending on the chemical).
What is the lead level in Hawthorne water?
The most recent 90th-percentile lead result for Golden State Water Company – Southwest is 1.7 ppb, for the monitoring period that began Jan 2024 (still in progress). The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for CA1910155: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID CA1910155).
- EPA SDWIS download: the lead results, population and violation records we use.
- Golden State Water Company – Southwest's 2026 water quality report (PDF): the utility's own annual report, including contaminants EPA's national database doesn't carry (link checked Nov 14, 2026). Phone: (310) 263-4141.
- Golden State Water Company – Southwest website
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.