Santa Ana, Calif. (April 21, 2026) – On April 14, 2026, Fitch Ratings affirmed the Orange County Treasury Pool the highest Fund Credit Quality Rating and Market Risk Sensitivity Rating…

LAKE FOREST, Calif. (April 16, 2026): On Thursday, April 16, 2026, shortly before 4 p.m., deputies were called to the area of Toledo Way and Ridge Route Drive for a pedestrian struck by an e-…

A number of documents are available on these pages that describe the regulations and programs aimed at preventing and controlling the discharge of pollutants to the municipal stormdrain system and…

While the 2007 Drainage Area Management Plan (DAMP) provides a foundation for the Orange County Stormwater Permittees to implement model programs designed to prevent pollutants from entering…

The County and cities of south Orange County are subject to a municipal separate storm sewer system permit (MS4 Permit) issued by the San Diego Regional Water Board (Water Board) which regulates…

Below is the Stormwater Program Effectiveness Assessment (PEA) for the County of Orange/Orange County Flood Control District (County), for the 2016-17 reporting period (July 1, 2016 - June 30,…

Please visit northocirwm.org for the most up-to-date information on Integrated Regional Water Management (IRWM) efforts in North and Central Orange County. Efforts to develop a combined …

Table of Contents: [Santa Ana Region] Acronyms Executive Summary Certification Page: [Santa Ana Region] Section C-1: Introduction Section C-2: Program Management Section C-3…