The base charge on your water bill, explained

What the base charge is

Most water bills have two kinds of charges: a fixed amount you pay for having service, and a usage amount that grows with the water you use. The Public Utility Commission of Texas calls the fixed part the monthly minimum charge, also called the base rate or customer charge. It defines it as a flat fee that does not change with the amount of water used each billing period, covering a utility’s fixed costs such as administration and system maintenance.

That’s why a vacation month, a vacant rental, or a month with almost no use can still produce a bill. Fixed costs like administration and system maintenance don’t stop when the tap does.

SourcePublic Utility Commission of Texas: Understanding Your Water and Wastewater Bill Charges · accessed Oct 10, 2026

Why meter size changes the fixed charge

Some utilities set the fixed charge by meter size. Denver Water’s 2026 residential rates (inside the City of Denver) show how steep that scale can be:

• ⅝″ and ¾″ meters: $20.91 per month
• 1″: $31.30
• 1½″: $60.88
• 2″: $102.31
• 3″: $220.76
• 4″: $386.50

SourceDenver Water: 2026 Rates · accessed Oct 10, 2026

This is one utility’s table, shown as an example. Your utility’s numbers will differ; find the meter size printed on your bill and look it up in your own rate schedule.

Base charge vs usage, sewer, and pass-through fees

The base charge is only one line. The Texas PUC’s bill glossary also defines:

• Gallon charge: water billed on the amount used in the period. With tiers, the price per gallon can rise in stages as use goes up.
• Wastewater charge: the cost of handling water that goes down your drains. Some utilities set it with winter months averaging, basing wastewater on winter use.
• Pass-through: charges a third party sets and the utility passes on (only the actual costs charged to the utility).
• Regulatory assessment fee: generally one-half to 1% of the water and wastewater base and gallonage charges.
• System improvement charge: in Texas, only assessed by investor-owned utilities, not water supply corporations, districts, or cities.

SourcePublic Utility Commission of Texas: Understanding Your Water and Wastewater Bill Charges · accessed Oct 10, 2026

Put the fixed part in proportion

Once you know your floor, look at the usage lines in the bill’s own units. EPA WaterSense notes one CCF equals 748 gallons, and the average American uses around 82 gallons per day per person at home. Utilities also use pricing schemes like seasonal, drought, and water-budget rates, so the usage part of the bill can move a lot while the base charge stays put.

SourceEPA WaterSense: Understanding Your Water Bill · accessed Oct 10, 2026

Use the splitter at the top of this page to see how much of your total is the zero-use floor and how much using less could actually change.

When the fixed charge is worth questioning

A normal base charge isn’t an error. These are worth a call to the utility:

• The meter size on the bill doesn’t match the meter at the house.
• Two base charges for one service, or the same fixed fee listed twice.
• A base charge after you asked the utility to stop service, for dates after the stop.
• A fee the bill doesn’t explain. Ask which rate schedule line it comes from.

Ask for the correction in writing and keep a photo of the meter with your bill.

Educational information, not legal advice. Your utility’s written rate schedule controls.