Can I fill my swimming pool with well water?

Yes, you can fill a swimming pool with well water. Thousands of homeowners do it successfully every year. However, there are important considerations: test your water first for iron, minerals, and pH levels; check your well's recovery rate to avoid running it dry; consider pre-treating the water if you have high iron or mineral content; and allow extra time for chemical balancing. With proper preparation, well water works perfectly fine for pools.

How long does it take to fill a pool with well water?

Filling time depends on your pool size and well flow rate. A typical well produces 5-10 GPM. At 5 GPM, a 15,000-gallon pool takes about 50 hours (over several days with rest periods). At 10 GPM, it takes around 25 hours. Important: Never run your well continuously—use the 50/50 rule (pump for 4 hours, rest for 4 hours) to protect your pump and allow aquifer recovery. Plan for 3-7 days total filling time for a typical residential pool.

Will well water stain my pool?

Well water can stain pools if it contains high iron, manganese, or copper levels. When iron-rich water meets chlorine, it oxidizes and can leave orange-brown stains on pool surfaces. To prevent staining: test your water before filling; use a metal sequestrant when filling; add stain and scale preventer; and treat iron above 0.3 ppm with a hose filter or pre-treatment. Existing stains can often be removed with specialized pool stain removers or mild acid treatments.

Is it cheaper to fill a pool with well water or have water delivered?

Well water is significantly cheaper—typically $30-$75 in electricity costs for a 15,000-gallon pool versus $200-$500+ for water delivery. However, factor in potential costs for pre-treatment filters ($30-$100), metal sequestrants ($25-$50), and extra pool chemicals for balancing ($20-$50). Even with these additions, well water usually costs 50-80% less than delivered water. The main trade-offs are time (well filling takes days vs hours for delivery) and the effort of managing your well during filling.

Can filling my pool damage my well?

Filling a pool can stress your well system if not done carefully. Running your pump continuously can cause overheating, premature wear, and aquifer depletion. Never pump continuously for more than 4-6 hours; allow equal rest time for recovery. Watch for warning signs like sputtering water, sediment, or air in lines—these indicate the well is struggling. If your well has a low recovery rate (under 3 GPM), consider supplementing with delivered water or filling over a longer period with more rest breaks.