Well Water Irrigation Systems

Using well water for specific applications requires understanding your well's capacity, your water quality, and the particular needs of each use case. Here's what San Diego County well owners need to know.

Know Your Well's Capacity

Before adding any significant water demand, understand what your well can produce:

• Flow rate (GPM): Your well's sustained production rate. Most residential wells in SoCal produce 3–15 GPM.
• Recovery rate: How quickly your well replenishes after heavy use. Some wells recover quickly, others need hours.
• Static water level: The resting water level in your well when the pump isn't running. Deeper static levels mean less reserve.
• Storage: The volume of water stored in your well bore above the pump. A 6-inch well stores about 1.5 gallons per foot of water column.

If you're planning a significant new use (pool, irrigation, livestock), have a flow test done first. It's much cheaper than burning out a pump from overuse.

Water Quality Considerations

Different uses have different water quality requirements:

• Drinking/cooking: Test annually for bacteria and nitrates. Comprehensive test every 3–5 years.
• Pools and hot tubs: High mineral content means more chemicals needed to balance. Iron stains pool surfaces. Test your well water and budget for treatment.
• Irrigation: Most well water is fine for landscaping. Very high TDS or sodium levels can damage sensitive plants. Avocado and citrus groves (common in Fallbrook, Valley Center, Bonsall) have specific water quality needs.
• Livestock: Animals are generally more tolerant than humans, but very high TDS, sulfate, or nitrate levels can cause health issues. Test if animals show signs of reduced water intake.
• Aquariums: Well water's stable temperature and mineral content can be great for fish, but chlorination residuals and heavy metals need to be addressed. Use an RO system for sensitive species.

Managing High Demand

If your well can't keep up with demand, you have several options:

• Storage tank: The most common solution for rural SoCal properties. A 1,000–5,000 gallon tank lets the well fill slowly while you draw water at higher rates when needed. Essential for horse properties, ranches, and homes with irrigation.
• Demand scheduling: Use a timer on irrigation to run during off-peak hours (late night/early morning) when household demand is zero.
• Low-flow fixtures: Modern fixtures use significantly less water while maintaining performance.
• Well deepening or hydrofracturing: If the well itself is the bottleneck, these options may increase yield.

Filling a Pool With Well Water

One of the most common questions we get. A typical pool holds 15,000–30,000 gallons. At 5 GPM, that's 50–100 hours of continuous pumping. Here's the smart approach:

• Fill slowly over several days—don't try to do it all at once
• Run the pump for 4–6 hours, then let the well recover for 4–6 hours
• Monitor your pressure tank for short cycling (sign of low water)
• Consider a water delivery service for the initial fill, then use well water for maintenance top-offs

Need Help Sizing Your System?

SCWS can evaluate your well's capacity and recommend system upgrades to handle your specific needs. Whether you're adding an irrigation system, building a horse facility, or just want to make sure your well can handle your growing family, we'll give you straight answers about what your well can and can't do.