Henninger Flats Potable Water and Non-Potable Water Systems Refurbishment Project (Project)


SCH Number
Lead Agency
Los Angeles County
Document Title
Henninger Flats Potable Water and Non-Potable Water Systems Refurbishment Project (Project)
Document Type
NOE - Notice of Exemption
Project Applicant
State Water Resources Control Board

Document Description
The Project replaced the previous treatment plant with a new treatment plant featuring a 30 gpm cartridge filtration system, automatic chlorination system, and storage tank recirculation pump; relining of two existing steel potable water storage tanks; replacement of 3,900 ft. of 2" raw water and ¾", 1 ", and 2" distribution system piping; and replacement of the existing 100 ft.2 treatment plant building with a new 200 ft. 2 treatment plant building. Infrastructure improvements were made to an onsite irrigation system that is separate from the potable water system and is not included in or covered by the drinking water permit.

Contact Information
Sutida Bergquist
State Water Resources Control Board
500 North Central Avenue, Suite 500
Glendale, CA 91203

Phone : (818) 551-2004


Los Angeles
Other Location Info
3 miles beyond a locked gate at 2260 Pinecrest Dr., up Mt. Wilson Toll Rd. in Altadena

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301, 15302, 15303, 15304
Reasons for Exemption
The Project involves minor alterations as all new facilities under this project are located on publicly-owned land. The new treatment plant and piping are located on the same site as the previous treatment plant and piping and involves no expansion of use beyond the previously existing facilities.


Notice of Exemption
2020020077_Henninger Flats Potable   PDF 849 K

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