Roseville Water Quality Report Issued
(City of Roseville, 2018)- Under the guidelines provided by the U.S. Environmental Protection Agency (EPA) and the State Water Resources Control Board, Division of Drinking Water, the City of Roseville monitors and tests the drinking water from source to tap.
Information provided in this report is for the water provided January through December 2017, and includes details about where your water comes from, what it contains, and how it compares to the standards set by the regulatory agencies.
Roseville Water sources
Drinking water (both tap water and bottled water) sources include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity. In 2017, only surface water was supplied by Roseville. We maintain a water distribution system that contains pipelines throughout the city ranging in size from four inches to over five feet in diameter. Staff collects water samples throughout the system and test on a weekly basis to ensure quality maintained during delivery to customers.
The surface water source from Folsom Lake is snowmelt water that flows from the Sierra Nevada Mountains. The melting snow flows into the North, middle, and South Forks of the American River and is ultimately stored in Folsom Lake. The Folsom Lake water is conveyed to, and treated at, Roseville’s 100 million gallon per day (MGD) water treatment plant. The treatment process comprises coagulation, sedimentation, filtration and disinfection. Fluoride is added for residents’ dental health and pH is adjusted to reduce corrosion.
As part of a regional water use agreement, the City of Roseville receives up to 10 MGD of treated surface water from Placer County Water Agency’s (PCWA) Foothill-Sunset water treatment plant. Water from PCWA originates in the Sierra snowpack from the Yuba-Bear and American River watersheds. The source water travels through a network of canal systems operated and maintained by PCWA and PG&E before it reaches the water treatment plant. The Foothill-Sunset water treatment plant uses coagulation, high rate settling via micro sand flocculation, filtration and disinfection. Water is fluoridated at the entry port to Roseville.
Roseville groundwater sources
Groundwater supply is important because it provides added water reliability to Roseville’s customers in case of droughts or emergency. Currently, the city maintains six aquifer storage and recovery (ASR) groundwater wells as a backup supply to the city’s primary surface water supply. ASR stores treated surface water into the ground for retrieval at a later date when water is needed. Groundwater is typically rain and snow that soaks through the ground and continues to move downward through pore (small openings) space in the soil until it reaches the aquifer under the city. The groundwater meets all water quality and health standards just like treated surface water, but may have aesthetic differences and sometimes is noticeable to some consumers. Two-thirds of Californians, along with half of all Americans (more than 95 percent for rural Americans) get their household water supplied from groundwater. In 2017, no groundwater was used for the city’s water supply demand.
City of Roseville. (2018, June). 2017 Water Quality Report
[Press release]. Retrieved from https://roseville.ca.us/cms/One.aspx?pageId=10209479