Jefferson Parish County Lake Quality
Louisiana, 3 lakes, average grade D (Nutrient-rich)
Jefferson Parish County has 3 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. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lake Cataouatche South of Avondale (D) is the cleanest in the county.
Where to stay near Jefferson Parish County
Top-rated places to stay near Jefferson Parish County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Jefferson Parish County?
Get lake water-quality report cards plus the best cabin & lodging deals near Jefferson Parish County — straight to your inbox. No spam, unsubscribe anytime.
Quick Answers for Jefferson Parish County
Planning a trip? Check special fishing regulations for Lake Cataouatche South of Avondale — or check the official Louisiana fishing regulations.
All Lakes in Jefferson Parish County
3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DLake Cataouatche South of AvondaleJefferson Parish | D | No recent samples | 110 µg/L | No recent samples | No recent samples | Not recorded |
| NRLake Salvador East of LockportJefferson Parish | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLittle LakeJefferson Parish | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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 Louisiana
See how Jefferson Parish 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.