Pinellas County Lake Quality

Florida, 42 lakes, average grade C (Fair)

Pinellas County's 42 graded lakes fall in the moderate-density bracket for Florida. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. Pinellas 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.

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 Pinellas-Hewitt Lake (B); the most-stressed is Alligator Lake (D).

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Quick Answers for Pinellas County

Cleanest lakes in Pinellas County →Cleanest lakes in Florida →Safest swimming lakes in Florida →

Planning a trip? Check special fishing regulations for Pinellas-Hewitt Lake — or check the official Florida fishing regulations.

All Lakes in Pinellas County

42 lakes · 30 graded, 12 not rated30 graded lakes · 12 not rated, hidden

Include not-rated lakes (12)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
1	BPinellas-Hewitt LakePinellas	B	5 ft	16 µg/L	No recent samples	No recent samples	Not recorded
2	BLake ChautauquaPinellas	B	4.3 ft	10 µg/L	No recent samples	No recent samples	Not recorded
3	BLake TarponPinellas	B	2.3 ft	30 µg/L	No recent samples	No recent samples	Not recorded
4	BPinellas-Bellevue LakePinellas	B	5 ft	27 µg/L	No recent samples	No recent samples	✓ Public
5	BPinellas-Tarpon LakePinellas	B	3 ft	31 µg/L	No recent samples	No recent samples	Not recorded
6	BPinellas-Meadow West LakePinellas	B	5 ft	35 µg/L	No recent samples	No recent samples	Not recorded
7	BPinellas-Salmons Bay LakePinellas	B	2.5 ft	36 µg/L	No recent samples	No recent samples	✓ Public
8	BMckay Creek LakePinellas	B	No recent samples	20 µg/L	No recent samples	No recent samples	✓ Public
9	CLake Tarpon CanalPinellas	C	3.6 ft	51 µg/L	No recent samples	No recent samples	Not recorded
10	CPinellas-Autu LakePinellas	C	2.8 ft	49 µg/L	No recent samples	No recent samples	Not recorded
11	CLake MaggiorePinellas	C	No recent samples	50 µg/L	No recent samples	No recent samples	✓ Public
12	DAlligator LakePinellas	D	2.6 ft	155 µg/L	No recent samples	No recent samples	✓ Public
13	DHarbor Isles LakePinellas	D	1.6 ft	95 µg/L	No recent samples	No recent samples	Not recorded
14	DLake SeminolePinellas	D	1.6 ft	60 µg/L	No recent samples	No recent samples	Not recorded
15	DLake SeminolePinellas	D	1 ft	63 µg/L	No recent samples	No recent samples	✓ Public
16	DPinellas-Jungle LakePinellas	D	2.3 ft	277 µg/L	No recent samples	No recent samples	Not recorded
17	DPinellas-Crescent LakePinellas	D	4 ft	77 µg/L	No recent samples	No recent samples	Not recorded
18	DLake SeminolePinellas	D	1 ft	75 µg/L	No recent samples	No recent samples	Not recorded
19	DPinellas-Harbor-Isle LakePinellas	D	3.5 ft	115.5 µg/L	No recent samples	No recent samples	✓ Public
20	DPinellas-Cliff Stephens Park LakePinellas	D	4.5 ft	124 µg/L	No recent samples	No recent samples	✓ Public
21	DPinellas-Winston LakePinellas	D	2.1 ft	82 µg/L	No recent samples	No recent samples	✓ Public
22	DPinellas-Seminole LakePinellas	D	1.5 ft	63 µg/L	No recent samples	No recent samples	Not recorded
23	DPinellas-Saundra LakePinellas	D	1.3 ft	101 µg/L	No recent samples	No recent samples	✓ Public
24	DPinellas-Alligator LakePinellas	D	2.2 ft	158.5 µg/L	No recent samples	No recent samples	Not recorded
25	DPinellas-Jungle North Inlet LakePinellas	D	1.5 ft	180 µg/L	No recent samples	No recent samples	Not recorded
26	DCrecent LakePinellas	D	No recent samples	80 µg/L	No recent samples	No recent samples	✓ Public
27	DJungle Lake@WfpPinellas	D	No recent samples	280 µg/L	No recent samples	No recent samples	✓ Public
28	DAlligator Creek LakePinellas	D	No recent samples	155 µg/L	No recent samples	No recent samples	Not recorded
29	DSouth Channel From Lake SuemarPinellas	D	No recent samples	150 µg/L	No recent samples	No recent samples	Not recorded
30	DLake Diane OutfallPinellas	D	No recent samples	190 µg/L	No recent samples	No recent samples	✓ Public
	NRRound LakePinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRLittle Salt Lake NePinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREagle LakePinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPinellas-Clearview LakePinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPasadena Lake WestsidePinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRBeckett Lake @ CenterPinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLake DisstonPinellas	NR	0.7 ft	94 µg/L	No recent samples	No recent samples	Not recorded
	NRWoody Ibis Park LakePinellas	NR	2 ft	340 µg/L	No recent samples	No recent samples	✓ Public
	NRPinellas-Jungle South Inlet LakePinellas	NR	1 ft	306 µg/L	No recent samples	No recent samples	✓ Public
	NRAlligator LakePinellas	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRPinellas-Jungle Outlet LakePinellas	NR	2 ft	205.5 µg/L	No recent samples	No recent samples	Not recorded
	NRChatauqref LakePinellas	NR	8.2 ft	7 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.

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Other Counties in Florida

Bay County

17 lakes · Avg grade B

Miami-Dade County

9 lakes · Avg grade B

Washington County

11 lakes · Avg grade B

Santa Rosa County

1 lake · Avg grade B

Wakulla County

6 lakes · Avg grade B

Jackson County

7 lakes · Avg grade B

See how Pinellas 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.