Walworth County Lake Quality

Wisconsin, 27 lakes, average grade B (Good)

There are 27 graded 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. With an average grade of B, Walworth County sits comfortably above the Wisconsin median.

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 Beulah (A) is the cleanest in the county.

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Quick Answers for Walworth County

Cleanest lakes in Walworth County →Cleanest lakes in Wisconsin →Safest 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 best-graded 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

27 lakes · 18 graded, 9 not rated18 graded lakes · 9 not rated, hidden

Include not-rated lakes (9)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	ALake BeulahWalworth	A	10 ft	13.4 µg/L	2.5 µg/L	No recent samples	58 ft	✓ Public
2	AGeneva LakeWalworth	A	21 ft	13 µg/L	2.1 µg/L	No recent samples	135 ft	✓ Public
3	BGreen LakeWalworth	B	11 ft	10.7 µg/L	No recent samples	No recent samples	57 ft	✓ Public
4	BPotter LakeWalworth	B	4.3 ft	35 µg/L	7.5 µg/L	No recent samples	26 ft	✓ Public
5	BPleasant LakeWalworth	B	12 ft	15.1 µg/L	No recent samples	No recent samples	29 ft	✓ Public
6	BBooth LakeWalworth	B	8 ft	15.9 µg/L	No recent samples	No recent samples	24 ft	Not recorded
7	BWhitewater LakeWalworth	B	4 ft	26.2 µg/L	No recent samples	No recent samples	35 ft	✓ Public
8	BTurtle LakeWalworth	B	11 ft	15.2 µg/L	No recent samples	No recent samples	30 ft	✓ Public
9	BMiddle LakeWalworth	B	10 ft	12.8 µg/L	No recent samples	No recent samples	40 ft	✓ Public
10	BMill LakeWalworth	B	7.5 ft	15.3 µg/L	No recent samples	No recent samples	40 ft	✓ Public
11	BArmy LakeWalworth	B	8.2 ft	11.7 µg/L	No recent samples	No recent samples	17 ft	✓ Public
12	BDelavan LakeWalworth	B	No recent samples	25.9 µg/L	No recent samples	No recent samples	52 ft	✓ Public
13	CDelavan LakeWalworth	C	8.9 ft	52.5 µg/L	9.1 µg/L	No recent samples	52 ft	✓ Public
14	CLake LorraineWalworth	C	No recent samples	48.9 µg/L	No recent samples	No recent samples	8 ft	✓ Public
15	DRice LakeWalworth	D	1.7 ft	60.3 µg/L	No recent samples	No recent samples	10 ft	✓ Public
16	DComus LakeWalworth	D	1.5 ft	193 µg/L	No recent samples	No recent samples	6 ft	✓ Public
17	DHoney LakeWalworth	D	2.5 ft	89.6 µg/L	No recent samples	No recent samples	6 ft	Not recorded
18	DOutlet To Lake GenevaWalworth	D	No recent samples	658 µg/L	No recent samples	No recent samples	135 ft	✓ Public
	NRPickerel LakeWalworth	NR	8.5 ft	No recent samples	No recent samples	No recent samples	31 ft	✓ Public
	NRSilver LakeWalworth	NR	3 ft	No recent samples	No recent samples	No recent samples	3 ft	✓ Public
	NRNorth LakeWalworth	NR	3.5 ft	No recent samples	No recent samples	No recent samples	11 ft	✓ Public
	NRLake WandawegaWalworth	NR	6 ft	No recent samples	No recent samples	No recent samples	8 ft	✓ Public
	NRPeters LakeWalworth	NR	5.6 ft	19.6 µg/L	No recent samples	No recent samples	8 ft	Not recorded
	NRSwan LakeWalworth	NR	6.8 ft	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	NRLake IvanhoeWalworth	NR	2.5 ft	No recent samples	No recent samples	No recent samples	10 ft	✓ Public
	NRSwift LakeWalworth	NR	6 ft	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLake BeulahWalworth	NR	No recent samples	No recent samples	No recent samples	No recent samples	58 ft	✓ Public

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.

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Other Counties in Wisconsin

Outagamie County

1 lake · Avg grade A

Washington County

15 lakes · Avg grade B

Kenosha County

12 lakes · Avg grade B

Marinette County

22 lakes · Avg grade B

Forest County

34 lakes · Avg grade B

Waushara County

32 lakes · Avg grade B

See how Walworth County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.

Source: EPA National Aquatic Resource Surveys, 2026.