How to Read a Water Bill: CCF, Rate Tiers, and Fixed Fees

Your water bill measures use in gallons or in CCF, and one CCF equals 748 gallons. Knowing that, plus which rate structure your utility uses, tells you what each extra gallon actually costs. The U.S. Environmental Protection Agency's WaterSense program explains how to read the parts of the bill.

1. Step 1: Find the unit

EPA says the most common units are the gallon and the CCF, short for centum cubic feet. A CCF, also written HCF (hundred cubic feet), is 100 cubic feet of water, and "C" comes from the Roman word for hundred. Gas utilities use it too.

Converting is a single multiplication:

• 1 CCF = 748 gallons
• 5 CCF = 3,740 gallons
• 13 CCF = 9,724 gallons

2. Step 2: Compare your use with typical use

EPA cites about 82 gallons per person per day in an average American household. For a family of four, that is 328 gallons a day, or about 9,840 gallons over 30 days, roughly 13 CCF. EPA rounds this to around 10,000 gallons. It also says an average family uses more than 300 gallons per day at home, with roughly 70% indoors and 30% outdoors, and that use is much higher in dry regions that irrigate heavily.

If your use is far above that for your region and household size, the bill is the first place it shows up. EPA adds that an increase with no extra outdoor watering could signal a leak.

3. Step 3: Look at the usage trend

Some bills include a graph of your use over the past year. Summer peaks are normal where lawns are watered. Utilities plan for those peaks, and some restrict outdoor watering to protect supply.

4. Step 4: Identify the rate structure

EPA describes several ways utilities charge:

• Flat fee: everyone pays the same regardless of use. Rare today.
• Uniform rate: one price per unit all year, which requires a meter.
• Increasing block rates: each higher block of use costs more per unit. Common in cities and places with limited supply.
• Declining block rates: each block costs less, found in rural farming areas or where big industrial users are served.
• Seasonal rates: higher rates in summer, lower in winter.
• Drought rates: prices rise with the local drought level.
• Water budget rates: your household gets a set allotment, with a higher rate past it.

The rate structure matters because it changes the value of saving. Under a uniform rate every gallon costs the same. Under increasing blocks, the last gallons you use are the most expensive, so cutting them saves the most.

5. Step 5: Separate fixed charges from variable charges

Many utilities combine a fixed base fee with a variable fee based on volume. EPA says fixed charges help cover maintaining and paying off infrastructure, while variable charges reflect treatment chemicals and the energy to move water. Sewer is often billed too, and EPA notes that many utilities have only one meter, so they charge sewer based on the water entering the house.

EPA's uniform-rate example is a $147.62 bill where roughly half is tied to the water used. That utility charged $0.00295 per gallon, about 3 cents per 10 gallons. Converting: 748 gallons times $0.00295 is about $2.21 per CCF.

6. A made-up example of tiers

This uses invented rates to show the effect, not any real utility's prices. Suppose the bill has a $20 base fee, $2.00 per CCF for the first 5 CCF, and $3.50 per CCF above that.

Using 1 CCF less, which is 748 gallons, saves $3.50 at the top tier. That is more than the $2.00 a unit would save in the first block. If your utility is on tiers, find where your use sits in them.

7. Step 6: Read the line items

Utilities typically list fees such as regulatory assessments or capital surcharges in a "billing detail" or "summary of charges" section. Explanations are usually on the back of the bill or on the utility's website, and the back often lists rebates or conservation programs.

8. Key takeaways

• 1 CCF is 748 gallons; check which unit your bill uses before comparing.
• A family of four at 82 gallons per person per day uses about 9,840 gallons, or about 13 CCF, in 30 days.
• The rate structure decides what extra water costs: tiers make the top gallons the priciest.
• Fixed fees do not fall when you use less, so only the variable part responds to savings.
• Sewer is often billed on the water entering your home.