How Clean Is Lake Laretta?
Lake Laretta has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3.8 ft. Phosphorus: 266 µg/L. Chlorophyll-a (algae): 21.7 µg/L. Trophic State Index: 68.
Cleanliness Snapshot
| Metric | Lake Laretta | North Dakota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 3.8 ft | — |
| Phosphorus | 266 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 21.7 µg/L | <10 = clean |
| Trophic State Index | 68 | <50 = clean |
How does Lake Laretta compare?
Lake Laretta's grade of D falls below the North Dakota state average of C. It ranks #6 of 9 lakes in Nelson County by water quality score. Multi-year monitoring data shows water quality is improving based on 4 years of records.