San Diego County Water Agencies

Verified from spec PDF (451 welding refs): AWWA C200, C205, C206, C207, C208, M-11, AWS D1.1, ASME IX. Also AWS A5.5/A5.20 (electrodes). Uses SSPWC (Green Book) for general construction. Operates up to 108" steel transmission pipelines.

Verified from Design Guidelines 2021: AWWA C200, C205, C206, C207, C208, M-11, AWS D1.1, D1.3. Uses GREENBOOK (SSPWC) + City WHITEBOOK. Also refs API 620/650 for tanks. Largest system in the region.

Verified from spec PDF: AWWA C200, C205, C207, C208, AWS D1.1. WPS per AWS D1.1 required. Complete 5-section standards package. Not SDWAS.

Verified from spec PDF + bid notice: Green Book (SPPWC) required. AWWA C200, C205, C206, C207, C208, AWS D1.1, ASME IX. Also references AWS D1.4 (reinforcing steel) and API 1104.

Verified: Military uses UFC/UFGS framework, NOT Green Book. Procurement through NAVFAC Southwest. Specific welding codes unverified from Camp Pendleton docs.

SDWAS participant — welding codes via SDWAS Section 15061. Also has own multi-volume Engineering Standards.

SDWAS participant — welding codes via SDWAS Section 15061. Also has own Design Standards.

SDWAS participant — welding codes via SDWAS Section 15061. Also has own Design & Construction Manual adopted by City Council.

Verified: Website lists Green Book (SPPWC 2012) + Regional Supplement + City amendments as standards. SDWAS participant.

Founding SDWAS member with supplemental general notes and recycled water specs.

Verified from spec PDF: AWWA C200, C206, C207, M-11, AWS D1.1 (casing), ASME IX (pipe welders). 'All steel pipe joints shall be full welded.' Also serves National City and South Bay ID.

Board-approved standard specs. Serves San Marcos, portions of Vista, Carlsbad, Escondido. Website blocks automated access — use browser.

MWD member agency serving western Riverside County. Standard specifications, standard drawings, and Developer Handbook available online. Has separate design requirements for water storage reservoirs. Welding codes not yet verified from public documents.

Verified: Uses Green Book (SPPWC) as base — their 'Modifications' doc is literally amendments to it. + SDWAS. Small city (~4,200 pop).

Largest municipal utility in the US. Serves 4 million people in the City of Los Angeles. Operates the LA Aqueduct (233 miles) from Owens Valley. Has own Engineering Standards Manual with welding requirements. CSCS standard drawings available online. Welding codes referenced but not independently verified from public docs.

THE largest water wholesaler in the US — serves 26 member agencies across 6 SoCal counties, 19 million people. Operates the Colorado River Aqueduct (242 miles) and participates in the State Water Project. Uses AWWA C200, C206, C207, C208, M-11, AWS D1.1, ASME IX. 100% RT on all butt welds for transmission pipelines. Requires certified welding inspectors per AWS QC1. Pre-construction submittals 30 days before welding. WPS/PQR per ASME IX and AWWA C206.

Own standards manual (currently being updated for 2026). AML downloadable. Not SDWAS.

Verified from Section 02400: Shop welding per AWS D1.1, field welding per AWWA C206, weld testing per AWWA C200. Welders qualified under AWS D1.1.

Water service provided by Sweetwater Authority. Uses Sweetwater's standards (welding codes verified via Sweetwater Design Standards).

One of the largest water districts in California — serves 900,000+ people across 555 square miles in western Riverside County. Engineering standards and standard drawings available online. Uses Green Book as base with agency amendments. Welding codes referenced but not yet independently verified from spec documents.

Founding SDWAS member (2004). Serves La Mesa, El Cajon, Lemon Grove, Spring Valley.

One of the largest water districts in OC. Serves Irvine, portions of Costa Mesa, Lake Forest, Newport Beach, Orange, Tustin, and unincorporated OC. Construction Manual with Standard Drawings & Technical Specifications available through Engineering Division. Welding codes not yet verified from public documents.

Founding SDWAS member. Website explicitly states: 'Lakeside Water District uses The Water Agencies' Standard Specifications.'

Serves 5.5 million people across 78 cities and unincorporated LA County territory. Operates 24 districts with 1,400+ miles of trunk sewers. Major capital improvement program. Partners with MWD on recycled water. Welding codes referenced but not independently verified from public docs.

Verified from spec PDF: AWWA C200, C205, C206, C207, C208, ASME IX. Field welding per AWWA C206. Welder quals per ASME IX. Contact development@olivenhain.com for current version.

Founding SDWAS member. Large agency with significant CIP pipeline work. Welding codes via SDWAS Section 15061.

SDWAS participant. Website blocked for automated access — specs via SDWAS.

Operated by City of Encinitas Utilities Dept. SDWAS participant via Encinitas.

Served by Sweetwater Authority. Uses Sweetwater's standards (welding codes verified via Sweetwater Design Standards).

Own standards manual adopted by ordinance (2020-02, Jan 21, 2020). Not SDWAS.

Small water district serving portions of east Orange, Villa Park, and unincorporated Orange County. Construction standards not publicly available online.

Regional wastewater treatment agency and MWD member serving 875,000+ residents in western San Bernardino County. Member agencies include Chino, Chino Hills, Cucamonga Valley WD, Fontana, Fontana Water Co., Montclair, Monte Vista WD, Ontario, and Upland. Construction standards not publicly available online.

Wholesale water provider and MWD member agency for Orange County. Represents 28 retail water agencies. Resource planning and water use efficiency advocacy. Primarily a planning/wholesaler agency; construction standards not publicly available.

Manages the Orange County Groundwater Basin serving 2.5 million residents through 19 water agencies. Operates the Groundwater Replenishment System (GWRS) — world's largest water purification system for indirect potable reuse. Primarily a groundwater management agency; pipeline construction standards not publicly available.

No construction standards published online. Engineering page has planning docs only. Contact Engineering Dept directly.

Wholesale water agency and MWD member. Serves eastern LA County communities including Claremont, Pomona, La Verne, West Covina, Azusa, Glendora, and Covina. Primarily a wholesaler; construction standards not publicly available.

MWD member agency focused on groundwater management and imported water distribution for the San Gabriel Valley. Serves over 1 million people through retail water agencies. Primarily a planning/wholesaler agency; construction standards not publicly available.

Very small rural district (Pauma Valley). Minimal website, no engineering docs online.