Mar 28, 2023
Nitrate levels are monitored in creeks throughout the Morro Bay watershed. While nitrates are essential for plant growth, excess amounts can lead to harmful algal blooms and low oxygen levels. Our data shows Good (low) levels of nitrates in upper Los Osos and Chorro Creeks, as well as the smaller creeks that drain into Chorro (Dairy, Pennington, and San Luisito Creeks). Middle and lower Chorro Creek and Warden Creek have Very Poor nitrate levels, which means the high concentrations of nitrates could make it difficult for wildlife to thrive. The creek segments are greyed out in areas where we lack adequate data to make an assessment.