Renville County Lake Quality
North Dakota, 2 lakes, average grade B (Good)
Renville County has 2 monitored 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. Every one of those lakes carries an A–F grade, so the county-level summary covers the full set rather than a monitored subset. With an average grade of B, Renville County sits comfortably above the North Dakota 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 Darling (A) is the cleanest in the county.
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Quick Answers for Renville County
Planning a trip? Check special fishing regulations for Lake Darling — or check the official North Dakota fishing regulations.
All Lakes in Renville County
2 lakes2 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALake DarlingRenville | A | 4.9 ft | 255 µg/L | 2.4 µg/L | No recent samples | ✓ Public |
| 2 | CLake DarlingRenville | C | 9.8 ft | 402 µg/L | 6.9 µg/L | No recent samples | ✓ Public |
Lake Match
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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 North Dakota
See how Renville County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.