Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Walworth County Lake Quality

Wisconsin, 30 lakes, measured by Wisconsin DNR

There are 30 monitored lakes in Walworth County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. 17 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county-wide picture is low-to-moderate phosphorus with clear summer transparency across most monitored lakes.

The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Lake Beulah.

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Quick Answers for Walworth County

Cleanest lakes in Walworth County →Cleanest lakes in Wisconsin →Best swimming lakes in Wisconsin →

Planning a trip? Check special fishing regulations for Lake Beulah, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.

Fishing in Walworth County

Walworth County Fishing Guide

Fish species and the cleanest lakes in Walworth County

DNR Reports (2)

Wisconsin DNR Fisheries Survey resources for lakes in Walworth County. browse all reports →

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

2023
Lauderdale Lakes Chain comprehensive survey, 2023
Comprehensive Survey · WI DNR · 2023 (PDF)
2021
Turtle Lake spring shocking survey, 2017, 2021
Spring Shocking Survey · WI DNR · 2021 (PDF)

All Lakes in Walworth County

30 lakes · 17 ranked on readings, 13 without enough sampling17 lakes ranked on readings · 13 without enough sampling, hidden

Include not-rated lakes (13)

#	Lake	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	Lake BeulahWalworth	10 ft	13.4 µg/L	2.5 µg/L	No recent samples	58 ft	✓ Public
2	Geneva LakeWalworth	21 ft	13 µg/L	2.1 µg/L	No recent samples	135 ft	✓ Public
3	Green LakeWalworth	11 ft	10.7 µg/L	No recent samples	No recent samples	57 ft	✓ Public
4	Potter LakeWalworth	4.3 ft	35 µg/L	7.5 µg/L	No recent samples	26 ft	✓ Public
5	Pleasant LakeWalworth	12 ft	15.1 µg/L	No recent samples	No recent samples	29 ft	✓ Public
6	Booth LakeWalworth	8 ft	15.9 µg/L	No recent samples	No recent samples	24 ft	Not recorded
7	Whitewater LakeWalworth	4 ft	26.2 µg/L	No recent samples	No recent samples	35 ft	✓ Public
8	Turtle LakeWalworth	11 ft	15.2 µg/L	No recent samples	No recent samples	30 ft	✓ Public
9	Middle LakeWalworth	10 ft	12.8 µg/L	No recent samples	No recent samples	40 ft	✓ Public
10	Mill LakeWalworth	7.5 ft	15.3 µg/L	No recent samples	No recent samples	40 ft	✓ Public
11	Army LakeWalworth	8.2 ft	11.7 µg/L	No recent samples	No recent samples	17 ft	✓ Public
12	Delavan LakeWalworth	8.9 ft	52.5 µg/L	9.1 µg/L	No recent samples	52 ft	✓ Public
13	Lake LorraineWalworth	No recent samples	48.9 µg/L	No recent samples	No recent samples	8 ft	✓ Public
14	Rice LakeWalworth	1.7 ft	60.3 µg/L	No recent samples	No recent samples	10 ft	✓ Public
15	Comus LakeWalworth	1.5 ft	193 µg/L	No recent samples	No recent samples	6 ft	✓ Public
16	Honey LakeWalworth	2.5 ft	89.6 µg/L	No recent samples	No recent samples	6 ft	Not recorded
17	Outlet To Lake GenevaWalworth	No recent samples	658 µg/L	No recent samples	No recent samples	135 ft	✓ Public
	Pickerel LakeWalworth	8.5 ft	No recent samples	No recent samples	No recent samples	31 ft	✓ Public
	Silver LakeWalworth	3 ft	No recent samples	No recent samples	No recent samples	3 ft	✓ Public
	North LakeWalworth	3.5 ft	No recent samples	No recent samples	No recent samples	11 ft	✓ Public
	Lake WandawegaWalworth	6 ft	No recent samples	No recent samples	No recent samples	8 ft	✓ Public
	Peters LakeWalworth	5.6 ft	19.6 µg/L	No recent samples	No recent samples	8 ft	Not recorded
	Swan LakeWalworth	6.8 ft	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	Lake IvanhoeWalworth	2.5 ft	No recent samples	No recent samples	No recent samples	10 ft	✓ Public
	Swift LakeWalworth	6 ft	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lake ComoWalworth	No recent samples	No recent samples	No recent samples	No recent samples	9 ft	✓ Public
	Goose PondWalworth	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Pell LakeWalworth	No recent samples	No recent samples	No recent samples	No recent samples	13 ft	✓ Public
	Tombeau LakeWalworth	No recent samples	No recent samples	No recent samples	No recent samples	26 ft	Not recorded
	Lulu LakeWalworth	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Source: the Wisconsin Department of Natural Resources. See data sources.