We read 21 results from Scwa - Laguna/Vineyard’s 2025 water quality report. No results over a legal limit; 7 above a health goal or guideline.
Serves about 184,896 people · Water system ID CA3410029 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenichighest measured · Groundwater wells · 2025 report | 7.3 ppb | 0.004 ppb | 10 ppb | Above the health goal1,825x the health goal |
| Chromium-6highest measured · Groundwater wells · 2025 report | 9.6 ppb | 0.02 ppb | 10 ppb | Above the health goal480x the health goal |
| Gross alpha (radioactivity)highest measured · Groundwater wells · 2025 report | 5.1 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · Groundwater wells · 2025 report | 2.46 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal49x the health goal |
| Radium-228highest measured · Groundwater wells · 2025 report | 1.02 pCi/L | 0.02 pCi/L | 5 pCi/L | Above the health goal54x the health goal |
| Total coliform bacteriahighest month · listed as a violation in the report · Distribution system · 2025 report | 1.59 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Uraniumhighest measured · printed as 2.7 pCi/L · Groundwater wells · 2025 report | 4.02 ppb | 0.6 ppb | 30 ppb | Above the health goal6.7x the health goal |
| Bariumhighest measured · Groundwater wells · 2025 report | 0.16 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineaverage · range 0.1 to 1.98 · Distribution system · 2025 report | 1.28 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 50 homes tested, 0 over the action level · Customer taps (50 sites) · 2025 report | 0.05 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range 9.4 to 35 · Distribution system · 2025 report | 28.3 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 20 to 60 · Distribution system · 2025 report | 50 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.51 to 0.84 · Distribution system, highest of 2 sources · 2025 report | 0.72 ppm | 1 ppm | 2 ppm | Below the health goal |
| Ironhighest measured · printed as 110 ppb · Groundwater wells · 2025 report | 0.11 ppm | — | 0.3 ppm guideline | Within the guideline |
| Lead90th percentile of 50 homes tested, 0 over the action level · Customer taps (50 sites) · 2025 report | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Manganesehighest measured · printed as 20 ppb · Groundwater wells · 2025 report | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · Groundwater wells · 2025 report | 2.1 ppm | 10 ppm | 10 ppm | Below the health goal |
| Total dissolved solidsaverage · range 140 to 390 · Groundwater wells, highest of 2 sources · 2025 report | 219 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Surface water treatment · 2025 report | 0.24 NTU | None set | 1 NTU | Below the legal limit |
| Hardnessaverage · range 2.75 to 3.63 · Surface water, highest of 2 sources · 2025 report | 3.22 gpg (55 ppm) | — | — | Soft |
| Sodiumaverage · range 15 to 170 · Groundwater wells, highest of 2 sources · 2025 report | 43 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Scwa - Laguna/Vineyard’s water between Feb 2024 and Oct 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA14 pptFound in 10 of 40 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS24 pptFound in 7 of 40 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS6.8 pptFound in 5 of 40 samples · highest resultNo federal limit in force for this one
- PFBS4.8 pptFound in 2 of 40 samples · highest resultNo federal limit in force for this one
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Radium and uranium
Found: Gross alpha (radioactivity), Radium-226, Radium-228, Uranium
What removes it: Reverse osmosis.
Bacteria and viruses
Found: Total coliform bacteria
What removes it: UV purification (and tell your utility).
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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