Los Angeles County Lake Quality
California, 1 lake, average grade D (Nutrient-rich)
Los Angeles County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. On average, Los Angeles County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Elizabeth Lake (D); the most-stressed is Elizabeth Lake (D).
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Quick Answers for Los Angeles County
Planning a trip? Check special fishing regulations for Elizabeth Lake — or check the official California fishing regulations.
All Lakes in Los Angeles County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DElizabeth LakeLos Angeles | D | No recent samples | 75 µg/L | No recent samples | No recent samples | Not recorded |
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in California
See how Los Angeles County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.