DUBLIN -- A water board took the first step Tuesday toward raising average household water bills in Dublin and part of San Ramon by $1.35 a month.

The Dublin San Ramon Services District board unanimously approved the first part of a rate increase that would go into effect July 1.

At its next meeting at 6 p.m. May 7, the board will consider another part of a proposed rate change when it discusses a proposal to indefinitely suspend collection of a $4.50 per month temporary infrastructure surcharge levied on residential bills.

Taken together, the actions would add $1.35 a month to the average bill of a household using 287 gallons per day.

District spokeswoman Sue Stephenson said the rate changes are aimed at collecting a larger share of district revenues from fixed charges, providing a more reliable revenue stream to bolster the district's credit rating.

The district supplies tap water to some 62,000 people in Dublin and the Dougherty Valley in San Ramon.

Contact Denis Cuff at 925-943-8267. Follow him at Twitter.com/deniscuff