Water Quality Report

Your water comes from all across the western United States, from the State Water Project in Sacramento to the Colorado River Aqueduct in Utah, and even the water under your feet in the Main San Gabriel Basin. Each source balances with the others to build a more reliable water future that you can count on.

Rowland Water District (RWD) continually pursues new water sources like recycled water and local water agreements like Puente Basin Water Agency, a joint powers authority with Walnut Valley Water District, to ensure our local communities and customers have water today, tomorrow and during the next drought.

RWD is committed to informing the public about where their water comes from, why that matters, and what they can do to protect it, just as our team does every day. We’ve built a library of video resources describing Where our Water Comes From. We also have a video series about the importance of the Colorado River and how it impacts our water supplies.

If you are curious about how the water you drink is treated, we encourage you to take a few minutes to watch a tour of our treatment facility.

Conservation is now a way of life here in California. As we seek new sources of water, we look for everyone to play a part in securing water for us all. From a conservation website supporting your efforts to conserve to educating and engaging with students at every level, we are here to provide you with the resources you need to help us safeguard our water supplies for generations to come.

We are devoted to caring for our neighbors and our future. We always will be.

In December 2002, Metropolitan Water District completed a source water assessment of its Colorado River and State Water Project supplies. Colorado River water is most vulnerable to the effects of recreation, urban and stormwater runoff, increasing urbanization in the watershed, and wastewater. The State Water Project is most vulnerable to the effects of urban and stormwater runoff, wildlife, agriculture, recreation, and wastewater. A copy of the assessment can be obtained by contacting Metropolitan Water District at (213) 217-6000.

In addition to these sources, Rowland Water District stores supplemental groundwater in the Main San Gabriel Basin and owns water rights in the Central Basin. Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the U.S. Environmental Protection Agency’s (USEPA) Safe Drinking Water Hotline at (800) 426-4791.

The sources of drinking water (both tap and bottled water) 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 materials, and can pick up substances resulting from the presence of animals or from human activity. To ensure that water is safe to drink, the USEPA and State Water Resources Control Board, Division of Drinking Water (DDW) prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. DDW regulations also establish limits for contaminants in bottled water that provide the same protection for public health.

Some people may be more vulnerable to contaminants found in drinking water than the general population. Immuno-compromised persons, such as those with cancer undergoing chemotherapy, people who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk for infections.

These people should seek advice about drinking water from their health care providers. USEPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by cryptosporidium and other microbial contaminants are available by calling the Safe Drinking Water Hotline at (800) 426-4791.

If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. RWD is responsible for providing high quality drinking water but cannot control the variety of materials used in household plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your water, you may have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline at (800) 426-4791 or at www.epa.gov/lead.

Unless otherwise noted, the data presented in this table is from testing completed January 1 – December 31, 2023. The state requires the District to monitor for certain contaminants less than once per year because the concentrations are not expected to vary significantly from year to year. Some of the data, though representative of the water quality, is more than one year old. Unregulated contaminant monitoring helps EPA and the DDW determine where certain contaminants occur and whether they need to be regulated.

For specific questions regarding this report or any additional questions related to District drinking water, please contact Elisabeth Mendez, Compliance & Safety Manager, at (562) 697-1726 or email info@rwd.org