Oceana County Lake Quality
Michigan, 4 lakes, average grade A (Excellent)
Oceana County has 4 graded 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. On average, Oceana County lakes grade an A. That puts it near the top of the Michigan county ranking.
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. Schmidt Lake (Aka (A) is the cleanest in the county.
Where to stay near Oceana County
Top-rated places to stay near Oceana County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Oceana County?
Get lake water-quality report cards plus the best cabin & lodging deals near Oceana County — straight to your inbox. No spam, unsubscribe anytime.
Quick Answers for Oceana County
Planning a trip? Check special fishing regulations for Schmidt Lake (Aka — or check the official Michigan fishing regulations.
Fishing in Oceana County
All Lakes in Oceana County
4 lakes · 2 graded, 2 not rated2 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | ASchmidt Lake (AkaOceana | A | 9 ft | 13.5 µg/L | 1.7 µg/L | No recent samples | No recent samples | Not recorded |
| 2 | ACrystal LakeOceana | A | 13.5 ft | 8 µg/L | 1.1 µg/L | No recent samples | 34 ft | Not recorded |
| NRPentwater LakeOceana | NR | 6.5 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRStony LakeOceana | NR | 6.5 ft | No recent samples | No recent samples | No recent samples | 43 ft | 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.
Lake Match
Which lake suits how you actually use one?
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 Michigan
See how Oceana 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.