Seminole County Lake Quality

Florida, 152 lakes, average grade B (Good)

Seminole County has 152 graded lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the grade distribution reflects that mix. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

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 Seminole-Secret Lake (B); the most-stressed is Seminole-East Lake (D).

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Quick Answers for Seminole County

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

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

All Lakes in Seminole County

152 lakes · 119 graded, 33 not rated119 graded lakes · 33 not rated, hidden

Include not-rated lakes (33)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
1	BSeminole-Secret LakeSeminole	B	4.5 ft	21.5 µg/L	No recent samples	No recent samples	Not recorded
2	BSpring LakeSeminole	B	2.9 ft	19 µg/L	No recent samples	No recent samples	Not recorded
3	BSeminole-Spring LakeSeminole	B	3 ft	24 µg/L	No recent samples	No recent samples	Not recorded
4	BSeminole-Little Howell LakeSeminole	B	5 ft	23 µg/L	No recent samples	No recent samples	Not recorded
5	BBear Gully LakeSeminole	B	2.6 ft	34 µg/L	No recent samples	No recent samples	Not recorded
6	BSeminole-Bear Gully LakeSeminole	B	3.3 ft	34.5 µg/L	No recent samples	No recent samples	Not recorded
7	BSeminole-Clear LakeSeminole	B	5.3 ft	21 µg/L	No recent samples	No recent samples	Not recorded
8	BSeminole-Crystal Bowl LakeSeminole	B	11 ft	10.5 µg/L	No recent samples	No recent samples	Not recorded
9	BSeminole-Silver LakeSeminole	B	13 ft	12 µg/L	No recent samples	No recent samples	Not recorded
10	BSeminole-Cub LakeSeminole	B	6.9 ft	15 µg/L	No recent samples	No recent samples	Not recorded
11	BSeminole-Triplet Middle LakeSeminole	B	3 ft	29.5 µg/L	No recent samples	No recent samples	Not recorded
12	BSeminole-Little Bear LakeSeminole	B	10 ft	14 µg/L	No recent samples	No recent samples	Not recorded
13	BHorseshoe North LakeSeminole	B	3.9 ft	32 µg/L	No recent samples	No recent samples	Not recorded
14	BMirror LakeSeminole	B	7.2 ft	20 µg/L	No recent samples	No recent samples	Not recorded
15	BSeminole-Little Mary LakeSeminole	B	7 ft	12 µg/L	No recent samples	No recent samples	Not recorded
16	BBuck LakeSeminole	B	6.1 ft	14 µg/L	No recent samples	No recent samples	Not recorded
17	BSeminole-Crescent LakeSeminole	B	6 ft	14 µg/L	No recent samples	No recent samples	Not recorded
18	BSeminole-Triplet South LakeSeminole	B	3.3 ft	40 µg/L	No recent samples	No recent samples	Not recorded
19	BSeminole-Mills LakeSeminole	B	6.3 ft	17 µg/L	No recent samples	No recent samples	Not recorded
20	BSeminole-Lost LakeSeminole	B	5 ft	17 µg/L	No recent samples	No recent samples	Not recorded
21	BLkannctr LakeSeminole	B	2.8 ft	21.5 µg/L	No recent samples	No recent samples	Not recorded
22	BSeminole-Quail PondSeminole	B	7 ft	18 µg/L	No recent samples	No recent samples	Not recorded
23	BLake FlorenceSeminole	B	7.4 ft	15 µg/L	No recent samples	No recent samples	Not recorded
24	BLkflorida LakeSeminole	B	3.9 ft	42 µg/L	No recent samples	No recent samples	Not recorded
25	BSeminole-Bear LakeSeminole	B	9 ft	14 µg/L	No recent samples	No recent samples	Not recorded
26	BLake MarkhamSeminole	B	5.8 ft	8 µg/L	No recent samples	No recent samples	Not recorded
27	BSeminole-Horseshoe North LakeSeminole	B	5 ft	20 µg/L	No recent samples	No recent samples	Not recorded
28	BLake YvonneSeminole	B	3.8 ft	22 µg/L	No recent samples	No recent samples	Not recorded
29	BSeminole-Concord LakeSeminole	B	3 ft	24 µg/L	No recent samples	No recent samples	Not recorded
30	BSeminole-Sylvan LakeSeminole	B	6 ft	19 µg/L	No recent samples	No recent samples	Not recorded
31	BSeminole-Wekiva LakeSeminole	B	7 ft	19 µg/L	No recent samples	No recent samples	Not recorded
32	BEast Crystal LakeSeminole	B	6.1 ft	30 µg/L	No recent samples	No recent samples	Not recorded
33	BYankee LakeSeminole	B	3 ft	7.5 µg/L	No recent samples	No recent samples	Not recorded
34	BSeminole-Triplet North LakeSeminole	B	3.5 ft	26 µg/L	No recent samples	No recent samples	Not recorded
35	BLake BrantleySeminole	B	9.5 ft	11.5 µg/L	No recent samples	No recent samples	Not recorded
36	BSeminole-Mary LakeSeminole	B	5.5 ft	17 µg/L	No recent samples	No recent samples	Not recorded
37	BLake KathrynSeminole	B	3 ft	25 µg/L	No recent samples	No recent samples	Not recorded
38	BSeminole-Rock LakeSeminole	B	5 ft	12 µg/L	No recent samples	No recent samples	Not recorded
39	BLake MobileSeminole	B	5.6 ft	30 µg/L	No recent samples	No recent samples	Not recorded
40	BSeminole-Tony LakeSeminole	B	5.8 ft	14 µg/L	No recent samples	No recent samples	Not recorded
41	BSeminole-Brantley LakeSeminole	B	9 ft	15 µg/L	No recent samples	No recent samples	Not recorded
42	BGrace Lake @ CenterSeminole	B	4.1 ft	42 µg/L	No recent samples	No recent samples	Not recorded
43	BLake GriffinSeminole	B	5.7 ft	22 µg/L	No recent samples	No recent samples	Not recorded
44	BLittle Bear LakeSeminole	B	3.6 ft	10.9 µg/L	No recent samples	No recent samples	Not recorded
45	BAmory LakeSeminole	B	5.6 ft	18 µg/L	No recent samples	No recent samples	Not recorded
46	BPrairie LakeSeminole	B	7.2 ft	16 µg/L	No recent samples	No recent samples	Not recorded
47	BSouth Triplet LakeSeminole	B	2.2 ft	33 µg/L	No recent samples	No recent samples	Not recorded
48	BKiwanis LakeSeminole	B	6.9 ft	20 µg/L	No recent samples	No recent samples	Not recorded
49	BGarden LakeSeminole	B	2.8 ft	41.5 µg/L	No recent samples	No recent samples	Not recorded
50	BMiddle Triplet LakeSeminole	B	2.7 ft	23 µg/L	No recent samples	No recent samples	Not recorded
51	BPearl LakeSeminole	B	9.5 ft	15 µg/L	No recent samples	No recent samples	Not recorded
52	BCrystal Bowl LakeSeminole	B	7.5 ft	7 µg/L	No recent samples	No recent samples	Not recorded
53	BLake HayesSeminole	B	5.1 ft	20.5 µg/L	No recent samples	No recent samples	Not recorded
54	BQuail PondSeminole	B	4.9 ft	12 µg/L	No recent samples	No recent samples	Not recorded
55	BRed Bug LakeSeminole	B	4 ft	19.5 µg/L	No recent samples	No recent samples	Not recorded
56	BGrassy LakeSeminole	B	5.5 ft	15 µg/L	No recent samples	No recent samples	Not recorded
57	BKewanee LakeSeminole	B	4.8 ft	28 µg/L	No recent samples	No recent samples	Not recorded
58	BBear LakeSeminole	B	5.9 ft	14 µg/L	No recent samples	No recent samples	Not recorded
59	BLake MarionSeminole	B	2 ft	38 µg/L	No recent samples	No recent samples	Not recorded
60	BDeforest LakeSeminole	B	3.3 ft	25 µg/L	No recent samples	No recent samples	Not recorded
61	BLake MarieSeminole	B	3.3 ft	23.5 µg/L	No recent samples	No recent samples	Not recorded
62	BTrout LakeSeminole	B	6.2 ft	13 µg/L	No recent samples	No recent samples	Not recorded
63	BLost LakeSeminole	B	2.4 ft	23 µg/L	No recent samples	No recent samples	Not recorded
64	BNorth Triplet LakeSeminole	B	2.8 ft	27 µg/L	No recent samples	No recent samples	Not recorded
65	BLake SeminarySeminole	B	12.5 ft	13 µg/L	No recent samples	No recent samples	Not recorded
66	BLake AnnSeminole	B	3.4 ft	29 µg/L	No recent samples	No recent samples	Not recorded
67	BTuskawilla LakeSeminole	B	6 ft	16 µg/L	No recent samples	No recent samples	Not recorded
68	BLake LotusSeminole	B	6.3 ft	14 µg/L	No recent samples	No recent samples	Not recorded
69	BCub LakeSeminole	B	6.1 ft	23.5 µg/L	No recent samples	No recent samples	Not recorded
70	BLake ConcordSeminole	B	2.1 ft	18 µg/L	No recent samples	No recent samples	Not recorded
71	BSylvan LakeSeminole	B	5.6 ft	14 µg/L	No recent samples	No recent samples	Not recorded
72	BLake CatherineSeminole	B	9.2 ft	43 µg/L	No recent samples	No recent samples	Not recorded
73	BLake MillsSeminole	B	6.4 ft	22 µg/L	No recent samples	No recent samples	Not recorded
74	BLake TonySeminole	B	6.6 ft	20 µg/L	No recent samples	No recent samples	Not recorded
75	BSpringwood LakeSeminole	B	3.8 ft	24 µg/L	No recent samples	No recent samples	Not recorded
76	BSecret LakeSeminole	B	3.7 ft	18 µg/L	No recent samples	No recent samples	Not recorded
77	BFairy LakeSeminole	B	3.3 ft	24.5 µg/L	No recent samples	No recent samples	Not recorded
78	BSeminole-Queens Mirror LakeSeminole	B	3 ft	41 µg/L	No recent samples	No recent samples	Not recorded
79	BSeminole-Rice LakeSeminole	B	4.8 ft	32 µg/L	No recent samples	No recent samples	Not recorded
80	BSeminole-Como LakeSeminole	B	6.1 ft	21 µg/L	No recent samples	No recent samples	Not recorded
81	BLakalma LakeSeminole	B	3.3 ft	43 µg/L	No recent samples	No recent samples	Not recorded
82	BLake EllenSeminole	B	3.8 ft	12 µg/L	No recent samples	No recent samples	Not recorded
83	BLake ProctorSeminole	B	3.1 ft	19 µg/L	No recent samples	No recent samples	Not recorded
84	BLake BelairSeminole	B	4.9 ft	9 µg/L	No recent samples	No recent samples	Not recorded
85	BLinden LakeSeminole	B	3.8 ft	22 µg/L	No recent samples	No recent samples	Not recorded
86	BSecretlk LakeSeminole	B	4.6 ft	21 µg/L	No recent samples	No recent samples	Not recorded
87	BGreenwood LakeSeminole	B	No recent samples	29 µg/L	No recent samples	No recent samples	Not recorded
88	BSeminole-Springwood LakeSeminole	B	3.5 ft	26 µg/L	No recent samples	No recent samples	Not recorded
89	BLkmrion LakeSeminole	B	2 ft	38 µg/L	No recent samples	No recent samples	Not recorded
90	BLkchrm LakeSeminole	B	3.9 ft	13 µg/L	No recent samples	No recent samples	Not recorded
91	BNonamelk LakeSeminole	B	3.3 ft	24 µg/L	No recent samples	No recent samples	Not recorded
92	BKiwanis Lake South of CenterSeminole	B	5.6 ft	8 µg/L	No recent samples	No recent samples	Not recorded
93	BGarden Lake OutflowSeminole	B	No recent samples	34 µg/L	No recent samples	No recent samples	Not recorded
94	CMyrtle LakeSeminole	C	2.8 ft	45 µg/L	No recent samples	No recent samples	Not recorded
95	CLake of the WoodsSeminole	C	5.6 ft	50 µg/L	No recent samples	No recent samples	Not recorded
96	CDeep LakeSeminole	C	6.9 ft	44 µg/L	No recent samples	No recent samples	Not recorded
97	CSeminole-Asher LakeSeminole	C	3 ft	54 µg/L	No recent samples	No recent samples	Not recorded
98	CAdldectr LakeSeminole	C	2.6 ft	44 µg/L	No recent samples	No recent samples	Not recorded
99	CQueens Mirror LakeSeminole	C	2.4 ft	55 µg/L	No recent samples	No recent samples	Not recorded
100	CLake AsherSeminole	C	3.9 ft	45.5 µg/L	No recent samples	No recent samples	Not recorded
101	CAsherlakeSeminole	C	2.6 ft	44 µg/L	No recent samples	No recent samples	Not recorded
102	CLake Searcy @ CenterSeminole	C	2.6 ft	46 µg/L	No recent samples	No recent samples	Not recorded
103	COw-Ctr LakeSeminole	C	1.1 ft	49.1 µg/L	No recent samples	No recent samples	Not recorded
104	CLake HowellSeminole	C	2.6 ft	44 µg/L	No recent samples	No recent samples	Not recorded
105	CBeaumont PondSeminole	C	3.9 ft	52 µg/L	No recent samples	No recent samples	Not recorded
106	CPine LakeSeminole	C	3.6 ft	48 µg/L	No recent samples	No recent samples	Not recorded
107	CQueensmirr LakeSeminole	C	2.6 ft	52 µg/L	No recent samples	No recent samples	Not recorded
108	CLake MinnieSeminole	C	2.3 ft	51 µg/L	No recent samples	No recent samples	Not recorded
109	DSeminole-East LakeSeminole	D	3.5 ft	60.5 µg/L	No recent samples	No recent samples	Not recorded
110	DSeminole-Jesup LakeSeminole	D	1 ft	91 µg/L	No recent samples	No recent samples	Not recorded
111	DSeminole-Jesup North LakeSeminole	D	1 ft	90 µg/L	No recent samples	No recent samples	Not recorded
112	DLkminnie LakeSeminole	D	2.3 ft	63.5 µg/L	No recent samples	No recent samples	Not recorded
113	DLklotuscen LakeSeminole	D	2.6 ft	85 µg/L	No recent samples	No recent samples	Not recorded
114	DLake DotSeminole	D	1.6 ft	60 µg/L	No recent samples	No recent samples	Not recorded
115	DDewdrop PoolSeminole	D	1.3 ft	65 µg/L	No recent samples	No recent samples	Not recorded
116	DSeminole-Howell LakeSeminole	D	2 ft	100 µg/L	No recent samples	No recent samples	Not recorded
117	DSweetwater Cove LakeSeminole	D	No recent samples	145.5 µg/L	No recent samples	No recent samples	Not recorded
118	DSweetwater Cove @ Riverbend Blvd LakeSeminole	D	No recent samples	132.5 µg/L	No recent samples	No recent samples	Not recorded
119	DSweetwater Creek LakeSeminole	D	No recent samples	106 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminole-Orienta North LakeSeminole	NR	4.8 ft	21 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminole-Orienta East LakeSeminole	NR	2.9 ft	30 µg/L	No recent samples	No recent samples	Not recorded
	NRLake Grace @ Se CornerSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRTwin LakesSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSeminole-Wildmere LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSeminole-West Crystal LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSeminole-Charm LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRUnnamedsem LakeSeminole	NR	3.6 ft	12 µg/L	No recent samples	No recent samples	Not recorded
	NRLake GenevaSeminole	NR	4.1 ft	55.5 µg/L	No recent samples	No recent samples	Not recorded
	NRGriffinctr LakeSeminole	NR	7.4 ft	15.5 µg/L	No recent samples	No recent samples	Not recorded
	NRTriplet LakeSeminole	NR	3 ft	28 µg/L	No recent samples	No recent samples	Not recorded
	NRLkjane LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREast Crystal Lake @ CenterSeminole	NR	4.9 ft	23 µg/L	No recent samples	No recent samples	Not recorded
	NRWood LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBearlk LakeSeminole	NR	7.2 ft	13 µg/L	No recent samples	No recent samples	Not recorded
	NRBcklk LakeSeminole	NR	6.6 ft	13 µg/L	No recent samples	No recent samples	Not recorded
	NRLake Florence S of CenterSeminole	NR	5.9 ft	16 µg/L	No recent samples	No recent samples	Not recorded
	NRMrrlakeSeminole	NR	11.5 ft	13 µg/L	No recent samples	No recent samples	Not recorded
	NRBrgully LakeSeminole	NR	1.6 ft	34 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminole-Horseshoe LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPairielakeSeminole	NR	7.5 ft	14 µg/L	No recent samples	No recent samples	Not recorded
	NRSeminole-Onora LakeSeminole	NR	6.8 ft	20.5 µg/L	No recent samples	No recent samples	Not recorded
	NRWilmerelk LakeSeminole	NR	8.9 ft	12 µg/L	No recent samples	No recent samples	Not recorded
	NRLkwoods LakeSeminole	NR	3 ft	32 µg/L	No recent samples	No recent samples	Not recorded
	NRLtllkhwl LakeSeminole	NR	3.6 ft	17 µg/L	No recent samples	No recent samples	Not recorded
	NRLakehwellSeminole	NR	2.6 ft	73 µg/L	No recent samples	No recent samples	Not recorded
	NRChari LakeSeminole	NR	0.3 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRLkeharney LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGrdnlk LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRRice LakeSeminole	NR	3.9 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRLkbrkett LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREast LakeSeminole	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGarden Lake CentroidSeminole	NR	3 ft	No recent samples	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

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17 lakes · Avg grade B

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See how Seminole 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.