Pool gallons
Length, width, average depth, and shape determine the total water volume.
Pool fill cost
Estimate the water bill cost to fill or top off a pool.
Pool fill cost depends on gallons, local water rate, sewer rules, base charges, and whether the utility offers a sewer adjustment for pool filling.
Quick estimates
Small pool
10,000 gallons$63-$150
Water plus possible sewer estimate before local rules.
Medium pool
20,000 gallons$125-$300
A common fill level that can trigger tiered pricing.
Large pool
30,000 gallons$188-$450+
Worth checking sewer adjustments and local water restrictions.
Water rate
Tiered rates can make a large one-time fill more expensive than normal use.
Sewer rules
Sewer may apply unless the utility offers a pool-fill adjustment or separate meter.
Top-offs
Evaporation, splash-out, backwashing, and leaks can add repeat costs after the fill.
Cost formula
Pool fill cost = pool gallons / 1,000 x water rate, plus sewer if billed.
A 20,000 gallon pool at $6.25 per thousand gallons is about $125 for water alone. If sewer is also billed at a similar rate, the total can roughly double.
Before filling, check whether your utility has a pool-fill form, sewer adjustment, drought restriction, or separate irrigation meter rule.
Pool fill water tools
Water usage calculator
Convert pool volume, top-offs, and normal household use into total gallons.
Open page10,000 gallon water bill
Price a smaller pool fill or top-off scenario.
Open pageSewer bill calculator
Check whether wastewater charges apply or a pool-fill sewer adjustment is needed.
Open pagePool pump electricity cost
Check whether pool equipment also raised the electric bill.
Open pageWater bill audit checklist
Review a high bill after a pool fill or top-off.
Open pageNormal water usage
Compare pool fill gallons with normal household usage.
Open pageLower water bill guide
Plan the next steps after a high pool-fill bill.
Open pageSummer utility bill calculator
Compare pool fill water with summer electricity, irrigation, and fixed fees.
Open pageFAQ
Short answers for search visitors and bill-checking moments.
How much does it cost to fill a pool with water?
A pool fill can cost under $100 or several hundred dollars depending on gallons, water rate, sewer charges, and local utility rules.
Does sewer apply when filling a pool?
Sometimes. Some utilities offer sewer adjustment forms for pool fills, while others bill sewer from metered water use. Check before filling.
How many gallons are in a pool?
A small pool may hold 10,000 gallons, while larger residential pools can hold 20,000 to 30,000 gallons or more.