DUBLIN — A supplier of treated sewage water to irrigate grass and landscaping will show off its latest project in a free public tour 10:30 a.m. Monday at Kolb Park, 8020 Bristol Road.

The Dublin San Ramon Services District invites the public to see the pipelines and sprinklers in a $3.9 million project delivering recycled water to central Dublin parks and school yards. An optional tour will be offered afterward of the agency's sewer plant in Pleasanton.

Nearly 20 percent of the water consumed in the district last year was recycled water used at parks, schools, golf courses, and other large landscaped areas.

The delivery pipes are purple to distinguish them from potable water pipes.

The services district supplies water to 62,000 people in Dublin and the Dougherty Valley in San Ramon, and treats sewage for 121,000 customers in Dublin, Pleasanton, and southern San Ramon.

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