Irrigation Runoff

How Irrigation Runoff Harms Water Quality

When landscapes are overwatered, excess water carries fertilizers, pesticides, and other chemicals into nearby storm drains, streams, and beaches. These contaminants, including nitrogen, phosphorous, and pesticides, can degrade water quality, leading to eutrophication, algal blooms, and toxicity to aquatic life. Moreover, overirrigation can contribute to soil erosion and sedimentation in water bodies. 

If you have hired a landscaping company to perform tasks on your property, please ensure that they are aware of and follow these guidelines. 

How You Can Help

• Apply pesticides and fertilizers after it rains.
• Follow manufacturer instructions to avoid over-applying pesticides or fertilizers. 
• Regularly inspect irrigation systems for leaks, clogs, and malfunctions, and promptly repair any issues. 
• Choose native and drought-tolerant plants for landscaping, as they require less water and are better adapted to local climate conditions.
• Apply a layer of mulch around plants and trees to retain soil moisture and reduce the need for frequent watering. 

Water Conservation Information

Contact

Phone: 858-704-3652
Email: cleanwater@delmar.ca.us
Submit Water Runoff Report