Flagler County Lake Quality
Florida, 6 lakes, average grade C (Fair)
Flagler County has 6 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. Flagler County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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. Flagler-Disston Lake (B) is the cleanest in the county.
Where to stay near Flagler County
Top-rated places to stay near Flagler 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 Flagler County?
Get lake water-quality report cards plus the best cabin & lodging deals near Flagler County — straight to your inbox. No spam, unsubscribe anytime.
Quick Answers for Flagler County
Planning a trip? Check special fishing regulations for Flagler-Disston Lake — or check the official Florida fishing regulations.
All Lakes in Flagler County
6 lakes · 4 graded, 2 not rated4 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BFlagler-Disston LakeFlagler | B | 1.5 ft | 27 µg/L | No recent samples | No recent samples | Not recorded |
| 2 | BCld LakeFlagler | B | 1.3 ft | 35.7 µg/L | No recent samples | No recent samples | Not recorded |
| 3 | CFlagler-Emerald LakeFlagler | C | 1.8 ft | 57 µg/L | No recent samples | No recent samples | ✓ Public |
| 4 | DDead LakeFlagler | D | 1.6 ft | 240 µg/L | No recent samples | No recent samples | ✓ Public |
| NRCrescent Lake E.Side Boat RampFlagler | NR | 1.5 ft | 88 µg/L | No recent samples | No recent samples | ✓ Public | |
| NRLake DisstonFlagler | NR | 1.3 ft | 33 µg/L | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. 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 Florida
See how Flagler 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.