San Mateo Canyon Hydrologic Area (901.4)
The San Mateo Canyon Hydrologic Area is divided up amongst the Counties of Riverside, Orange, and San Diego. Headwaters for the system are located in Riverside County; however, it drains runoff from all three counties before discharging to the Pacific Ocean in San Diego County. Approximately 31,000 acres of the system lies within the borders of San Diego County.
Of the portion that is within San Diego County, approximately fifty-three percent (53%) is incorporated into Marine Corps Base Camp Pendleton. The remaining portions are unincorporated and include some park lands and other open spaces.
The primary water body within the system of course, is San Mateo Creek. It is fed by a number of smaller creeks and tributaries, including Christianitos Creek. Water bodies within the San Mateo Hydrologic Area have fortunately avoided many of the water quality issues that are present in many developed watersheds, and as such, have avoided any 303(d) listings.
Which Marine Corps Base is located in the San Mateo Canyon Hydrologic Area?
San Onofre Hydrologic Area (901.5)
The San Onofre Hydrologic Area is completely within the boundaries of the County of San Diego. It encompasses approximately 37,500 acres near the northern border of the County and is dedicated primarily to military uses associated with Marine Corps Base Camp Pendleton. In fact, only about three percent (3%) of the land within the hydrologic area is not military land.
The system contains a number of important water features, including San Onofre and Jardine Creeks. These creeks, along with their associated tributaries, converge in San Onofre Valley before discharging into the Pacific Ocean. Similar to the San Mateo Canyon Hydrologic Area, the San Onofre Hydrologic Area has largely avoided the impairments that plague more developed watersheds.
What portion of the San Onofre Hydrologic Area is dedicated to military uses?
San Diego Regional Water Quality Control Board (San Diego Regional Board). 2016 (August 5). Basin Plan. San Diego, CA. Available: http://www.waterboards.ca.gov/sandiego/water_issues/programs/basin_plan.
South Orange County MS4 Copermittees. 2016. South Orange County (San Juan Hydrologic Unit) Water Quality Improvement Plan (WQIP). Draft, April 1, 2016. Submitted to the San Diego Regional Water Quality Control Board by the San Juan Copermittees.
State Water Resources Control Board. 2010. California’s 2010 Clean Water Act Section 303(d) List of Water Quality Limited Segments. Approved October 11, 2011. Sacramento, CA: State Water Resources Control Board.
Whether you become involved in the public process or you simply take steps to limit your own water usage in and around your home, you can become a part of the solution.
Think about replacing sod and other water-intensive shrubbery with drought-tolerant landscaping. As a result of the drought, many jurisdictions and water agencies actually offer rebates and other incentives to remove natural turf and install rain barrels and other water capture devices. Not only will this save you money up front, but it will also reduce your monthly water bill! Keep in mind that irrigation runoff from your property is prohibited and can result in a fine.
Limit car washing and power-washing of building exteriors as much as possible. If your vehicle is in need of some TLC, then consider taking it to a certified car wash. If you are on a budget, then wash your car over permeable or unpaved surfaces, allowing any excess water to be absorbed into the soil instead of running into storm drains.
Dispose of pest waste appropriately. When taking your dog for a walk, make sure that you always have a bag on hand so that when nature calls, you are ready. This will help prevent bacteria and pathogens that can cause illness from getting into our waterways.
If you have some free time and don’t mind getting your hands a little dirty, many conservancies and foundations host clean up events for local creeks and lagoons. Please see our calendar to learn more about what events are being offered in your area!
Don’t litter! Trash on our roadways and in our yards has a tendency to make its way to creeks, rivers, and ocean waters during rain events. Even consider carrying a bag with you to collect litter as you take your morning or evening neighborhood stroll.
Implementation and adaptation of the Water Quality Improvement Plan is an ongoing process and as always, public input is encouraged. Meetings that are open to the public are posted in a timely manner to allow for public involvement. If you are interested, please check out our calendar for upcoming meetings.
If you observe any discharges of water that you believe may be illicit, then do not hesitate to report it by means of our pollution reporting page.
And lastly, do what you can to spread the word! Sometimes the most effective strategy is the simplest one. Now that you are a water quality expert, we are relying on your help to educate your coworkers, family, and friends.