Important Information About Your Drinking Water

Important Information About Your Drinking Water: All of Kernville Water System in Compliance with Drinking Water Standard for Haloacetic Acids (HAA5); Recent Samples Show Average Levels in Small Area Previously Affected Continue to Decrease

Dear California Water Service (Cal Water) Customer:

Water quality testing for haloacetic acids (HAA5) at 107 Juniper in the fourth quarter of 2018 had a Locational Running Annual Average (LRAA) of 38 ug/L, and at 1235 Sycamore, the LRAA was 8 ug/L. This remains in compliance with the HAA5 MCL of 60 ug/L.

The Kernville water system is required to take samples from two sites [107 Juniper and 1235 Sycamore] approved by DDW, every quarter, in the water distribution system. The samples collected during the fourth quarter 2018 at 107 Juniper had detections of HAA5 at an average of 25 ug/L. The samples taken at 1235 Sycamore had an average of 5 ug/L.

Residents living on Oak Court, Oak Place, Juniper Drive, Alder Court, and Grandview in Kernville are in the same zone as 107 Juniper and, therefore, have similar water quality. Testing at this location affects about 50 customers. Please see the attached map for more precise details about the area within our Kernville system.


We closely monitor our water system for the presence of drinking water contaminants. The Kernville water system uses the Kern River as its water source. In 2016 and 2017, runoff from winter storms contributed to higher levels of total organic carbon (TOC) material in the Kern River supply. The presence of higher levels of TOC creates a treatment challenge in our state-of-the-art surface water treatment plant. Higher than normal TOC levels along with chlorine from our disinfection process contribute to the formation of disinfection byproducts, which are measured as HAA5 and total trihalomethanes (TTHM).

Some people who drink water containing HAA5 in excess of the MCL over many years may have an increased risk of cancer. If you have other health issues concerning the consumption of this water, you may wish to consult your doctor.

Protecting your health and safety is our highest priority. Upon receiving the first high result in February 2016, we immediately began making operational changes in the water treatment plant and water distribution system to reduce HAA5. These changes included adjusting the amount of disinfection used to effectively treat the water and modifying storage tank levels to encourage turnover and decrease water aging in the system. State-mandated reductions in water use during the historic drought increased the aging of water in the distribution system.

Since April 2016, we also installed a pilot granular-activated carbon (GAC) treatment unit that removes TOC from the source water. Initial sampling of the pilot system demonstrated effective removal of TOC. We recently met with the State Water Resources Control Board’s Division of Drinking Water in an effort to receive grant funding from the State for full-scale GAC treatment at the Kernville treatment plant. We are continuing to pursue this option so that customers do not have to bear those costs.

We will continue to work diligently to maintain water quality. If we were again to exceed the LRAA in any part of the Kernville water system quarterly, we will notify you in accordance with Title 22 of the California Code of Regulations. For more information, please contact our local Cal Water Customer Center at (760) 379-5336.

Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this public notice in a public place or distributing copies by hand or mail.

Secondary Notification Requirements

Upon receipt of notification from a person operating a public water system, the following notification must be given within 10 days [Health and Safety Code Section 116450(g)]:

  • SCHOOLS: Must notify school employees, students, and parents (if the students are minors).
  • RESIDENTIAL RENTAL PROPERTY OWNERS OR MANAGERS (including nursing homes and care facilities): Must notify
  • BUSINESS PROPERTY OWNERS, MANAGERS, OR OPERATORS: Must notify employees of businesses located on the

You can do this by posting this public notice in a public place or distributing copies by hand or mail. This notice is being sent to you by California Water Service’s Kernville system.

State Water System ID#: 1510033
Date distributed: December 31, 2018