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June 13, 2021 9:43AM
June 13, 2021 9:43AM

customer care

Natural Treatment Site: Old Laguna

Old Laguna NTS site

Old Laguna has regular water quality monitoring, as well as deployed water quality sondes which continuously measure a variety of water quality parameters. It also has a Solar Bee aerator to help prevent algal growth in the slow-moving pools. It has been occasionally taken offline to facilitate repairs. 

Water quality monitoring at the site shows good removal rates for ammonia, nitrogen, phosphorus, selenium, and suspended solids. It went online in February of 2006.


 Location & Size

ocation: 16585.5 Laguna Canyon Road, Irvine
Size: 2.5 acres
Tributary Watershed: 231 acres

  Biological Values

he site is somewhat isolated, and wildlife values are low.  Additionally, African Clawed Frogs were discovered at the site this year, which may warrant further action, such as draining the site to facilitate removal. The following nesting bird species were observed on the site: Marsh Wren, Bewick’s Wren, House Wren, Mallard, Western Bluebird, House Finch, Black Phoebe, Tree Swallow, Common Yellowthroat, Song Sparrow, American Crow, Greater Roadrunner, Yellow Warbler, Mourning Dove, Yellow-breasted Chat, American Coot, Bullock’s Oriole, Ash-throated Flycatcher, American Robin, Cooper’s Hawk, Red-shouldered Hawk. Additional wildlife observations are planned for next year’s report.  


Routine Maintenance Activities:

    • TruGreen LandCare provides routine irrigation and landscape maintenance services at the site. Additional work such as mulch replacement, irrigation repairs, aquatic herbicide application, aquatic vegetation removal, and sediment removal were performed throughout the year.
    • System operations staff performed weekly site inspection, water quality monitoring, and landscape and irrigation maintenance review.

Major Repairs: The slope along Laguna Canyon Road (which the City of Irvine maintains an easement upon) was excavated in part to install a manhole for a fiber optic cable.  Sediment removal at this site is planned.