Boiseans who watch their bills carefully may have noticed the city hasn’t adjusted sewer charges this year.

That’s about to change, city spokesman Vince Trimboli said.

The bi-monthly statements going out in September and October should show the adjustments, Trimboli said.

Traditionally, Boise recalculates residents’ sewer rates each spring based on their January and February water use, revenue officer Jon Williams said. The city’s formula relies on data from winter usage because most of that water is flushed or sent down a drain. Lawn and garden watering factors heavily in many residents’ summer water demand.

This year, however, delays in assembling data from United Water, which serves Boise residents, pushed back the adjustment, Trimboli said.

United Water Idaho spokesman Mark Snider said the utility’s water-use reports have a new format this year. He said the city asked for the full reports in mid-June, and United Water provided them in early July.

Because of the delay, some customers paid less in recent months than they would have if the adjustment took place in a normal timeframe. Others paid more. Overall, the city shouldn’t see a significant change in revenue from sewer bills, Williams said.

Some customers will see the adjustment in September, Trimboli said. Because Boise bills each customer every other month, some will not see the change until October.

Sven Berg: 377-6275