Weaverville Community Services District water quality
Douglas City, CA · serves 3,975 people (1,536 connections) · Surface water · Local government · EPA ID CA5310001
Data: U.S. EPA · How we read the data · How we check it
Summary
PFAS above the 2024 federal limits. Systems have until 2029 to meet the PFAS limits.
Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility ever issues a boil-water or do-not-drink notice, follow it.
- PFAS
- Above limitPFOS above the federal limit in EPA's 2023–2025 testing (PFOS 12.4 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lead
- Below action level1.2 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
- Resolved1 health-based violation since 2016, most recently Dec 2025.
- Pregnant, or mixing baby formula with tap water? Babies drink more water for their size, so PFAS exposure matters more for them. Consider bottled water or a filter certified for PFAS for formula, and ask your doctor. Health effects.
- To lower your PFAS exposure now, a home filter certified for PFAS reduction works (reverse osmosis, or activated carbon certified to NSF/ANSI 53 or 58). Filters for these results.
- 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 Weaverville Community Services District's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (530) 623-5051. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 3 entry points tested Mar 2023 to Sep 2024. "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 Above limit Limit 4 ppt | 12.4 ppt 3.1× the limit |
| PFHxS Detected, below limit Limit 10 ppt | 1.4 ppt 14% of the limit |
| 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) Detected, below limit Limit 1 | 0.14 |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
For context: the PFOS average is higher than at 91% of the California systems EPA tested.
29 PFAS tested, 2 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
Not detected in 12 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 1.2 ppb lead (Jan 2024 – now (in progress)). Below action level
Highest since 2016: 11.7 ppb (Dec 2023).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2024 – now (in progress) | 1.2 ppb |
| Jan 2021 – Dec 2023 | 11.7 ppb |
| Jan 2020 – Dec 2022 | 0 ppb |
Earlier results (9)
| Jan 2016 – Dec 2018 | 0 ppb |
| Jan 2011 – Dec 2013 | 7 ppb |
| Jan 2009 – Dec 2009 | 0 ppb |
| Jan 2006 – Dec 2006 | 5.5 ppb |
| Jan 2004 – Dec 2004 | 0 ppb |
| Jan 2003 – Dec 2003 | 0 ppb |
| Jan 2002 – Dec 2002 | 5.5 ppb |
| Jan 2001 – Dec 2001 | 5 ppb |
| Jan 1999 – Dec 2001 | 6 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
| When | What happened |
|---|---|
| Dec 2025 | A required step to remove or kill germs (filtration, disinfection or fixing a contaminated well) was not done properly. EPA record: Surface Water Treatment Rule · Treatment Technique (SWTR and GWR) (limit ) Archived |
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.
Where it serves
Douglas City
ZIP codes the system reported serving: 96024, 96093
Nearby utilities
- City of Redding Redding · 30 mi · PFAS above limit
- California Water Service – Chico Chico · 84 mi · PFAS above limit
- City of Ukiah Ukiah · 104 mi · PFAS above limit
- City of Gridley Gridley · 109 mi · PFAS above limit
- City of Yuba City Yuba City · 124 mi
- City of Wheatland Wheatland · 137 mi · PFAS above limit
Questions
Is Weaverville Community Services District water safe to drink?
Weaverville Community Services District had 1 health-based violation since 2016, all since resolved. EPA testing found PFAS above the 2024 federal limits, which systems must meet by 2029. 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 Weaverville Community Services District water have PFAS?
Yes. EPA's 2023–2025 testing of Weaverville Community Services District found 2 PFAS at least once. The highest entry-point averages were above the federal limit for PFOS: PFOS 12.4 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in Weaverville Community Services District water?
The most recent 90th-percentile lead result for Weaverville Community Services District is 1.2 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 CA5310001: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID CA5310001).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Weaverville Community Services District at (530) 623-5051, or see EPA's guide to finding it.
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.