Hendersonville, NC Water Leak Cost Calculator: What a Leak Adds to Your Bill

Step 1: find your normal usage on the bill

The calculator needs two numbers: how much water you normally use in a month and how much the leak added. The City's Understanding Water Usage page explains that usage is billed in hundreds of gallons, so multiply the usage figure on your statement by 100 to get gallons. A household that normally shows 40 on the usage line uses about 4,000 gallons a month.

Use a month from before the leak started, ideally the same month a year earlier, since summer irrigation and winter guests both move the number. The City's leak policy uses a twelve-month average to decide normal usage, so averaging several months yourself gets you closer to how the City will see it.

Then estimate the leak. If you know the meter reading before and after, the difference minus your normal use is the leak. If not, enter a gallons-per-day guess and a number of days. The point is to see the order of magnitude, not to predict a bill to the cent.

Step 2: understand why a leak costs more per gallon

Residential water is charged in tiers. Inside city limits, the first 3,000 gallons cost $4.73 per 1,000, the next band to 6,000 gallons costs $6.31, the band to 14,000 gallons costs $7.89, and everything above 14,000 gallons costs $9.47. A leak sits on top of your normal use, so it is billed at the higher tiers, not the lowest one.

Outside city limits the same tiers are higher, from $5.44 up to $10.89 per 1,000 gallons, and the 3/4-inch base charge is $14.43 instead of $12.55. Base charges do not change when you leak, which is why the calculator leaves them out and shows only the added amount.

Sewer is the other half. The City charges sewer on all metered usage at $8.91 per 1,000 gallons inside city limits and $13.37 outside. A leak in the yard never reaches the sewer, but it still passes through the meter, so it is billed on the sewer line until an adjustment says otherwise.

Step 3: read the worked scenarios

The scenario table below uses the same tiers as the calculator for five cases on a 3/4-inch meter. A household using 4,000 gallons a month that springs a 1,000-gallon leak pays about $15.22 more inside the city. The same household with a 10,000-gallon leak pays about $164.84 more, because the extra water lands in the $7.89 and $9.47 tiers.

A 20,000-gallon leak on top of 4,000 gallons of normal use adds about $348.64 inside the city and $463.38 outside. A larger home using 6,000 gallons that loses 30,000 gallons to a broken line pays about $538.76 more inside the city. Those are the numbers that make a crawlspace leak worth finding quickly.

Each total splits into a water part and a sewer part, which matters for the next step. Under the City's policy, the sewer part of a leak that never reached a drain is treated differently from the water part.

Step 4: estimate what the leak adjustment might return

The City's 2026 leak policy does not refund a leak in full. It adjusts the two highest billing cycles during the leak down to 1.5 times your normal monthly usage. With 4,000 gallons as normal, the adjusted usage for each of those cycles would be 6,000 gallons, and you pay for that amount instead of the full metered volume.

If the water went down a drain, as with a running toilet or a dripping faucet, the adjustment covers water and sewer together. If it did not, as with a burst yard line, the policy removes the sewer charges caused by the leak entirely and adjusts the water charges. That sewer removal does not count toward the $3,000 combined maximum.

Adjustments under $20.00 are not given unless the City made the error, and you get one adjustment per meter every 24 calendar months. The leak adjustment checklist explains the paperwork.

Step 5: decide what to do with the number

If the calculator shows a leak adding a few dollars a month, it is still worth fixing, because slow leaks under a house rot framing and feed mold long before they move the bill much. If it shows hundreds of dollars, the leak is large enough to find today, and the leak detection checklist walks through the meter test you can do yourself.

Keep a copy of the result with your bills. When you call a plumber, the size of the leak in gallons per day tells them a lot about whether it is a fixture, a supply line under the slab or a service line in the yard.

If the bill is already due and larger than you can pay, read the billing policy checklist for the 20-day due date and the payment plan section. The leak policy itself says customers must pay on time or enter a payment arrangement to stay in good standing while an adjustment is reviewed.

Checked against: City of Hendersonville, NC: Fee Schedule (water, sewer, meter, rebate and billing fees); City of Hendersonville, NC: Understanding Water Usage; City of Hendersonville, NC: 2026 Leak Adjustment Policy (PDF); City of Hendersonville, NC: Utility Billing Policy (effective October 1, 2026). Checked 2026-10-30.