Locus Technologies Launches MS4 Stormwater Software to Help Municipalities Manage Regulatory Compliance
New application connects inspections, illicit discharge investigations, public outreach, and reporting with the broader Locus water portfolio.
MOUNTAIN VIEW, Calif., November 10, 2026 —Locus Technologies, the leader in science-grade environmental information management, water quality, and EHS compliance software, today announced the launch of Locus MS4 Stormwater, a new application for U.S. municipalities and public agencies responsible for Municipal Separate Storm Sewer System (MS4) permit compliance. The software brings stormwater program records, field activities, and follow-up into one configurable cloud application, helping teams document the work required by their permits and prepare compliance reports.
MS4 programs establish control measures, public education, and operational best practices to prevent pollution from entering stormwater networks and reaching rivers, lakes, and other receiving waters. Program managers must coordinate activities across a variety of departments often with limited staff. When records are scattered across spreadsheets, email, paper forms, and shared drives, assembling evidence of compliance can become a substantial administrative task.
Locus MS4 Stormwater is designed for small and midsize municipalities with Phase II programs. The application organizes records around permit requirements, minimum control measures, and the associated best management practices. Teams can document public education and participation, illicit discharge detection and elimination, construction runoff controls, post-construction stormwater management, and pollution prevention efforts.
“An MS4 coordinator needs to satisfy several control measures under a specific timeline,” said Laura Underwood, director of digital water services at Locus Technologies. “We built this application to keep MS4 activities structured and organized. The app allows users to collect all needed information to satisfy specific permit obligations, streamline administration of program activities, and make annual reporting submissions earlier to assemble.”
The application maintains asset specific details such as facility and outfall locations. Teams can log illicit discharge complaints, field observations, water quality measurements, and corrective follow-up. Outreach records capture public education and volunteer activities, keeping supporting information available for annual reports and regulatory reviews. Forms, workflows, and reporting can be configured to local permit requirements.
The application’s construction-related modules help municipalities administer stormwater requirements from plan review through post construction at any given development site. Built on the Locus Platform alongside backflow prevention, drinking water, and wastewater management software, MS4 Stormwater can be combined with Locus EIM analytical data, sample planning, mobile, and GIS capabilities.
“Municipalities need continuity across water programs and through changes in staff,” said Neno Duplan, founder and CEO of Locus Technologies. “MS4 Stormwater gives teams a configurable foundation they can expand while keeping compliance history accessible.”
To learn more about Locus MS4 Stormwater or request a demonstration, please visit www.locustec.com or contact info@locustec.com.
ABOUT LOCUS TECHNOLOGIES
Locus Technologies pioneered cloud-native software and agentic AI innovation for EHS compliance, water management, and ESG reporting in 1997 and it remains the longest serving independent provider across these sectors. Organizations ranging from mid-size enterprises to Fortune 100 corporations rely on Locus to manage more than half a billion environmental records worldwide. Locus software manages air, water, waste, energy, emissions, site, and incident data within a configurable platform for risk mitigation and regulatory reporting. With industry-leading methods for data intake, artificial intelligence, queries, validation, tracking, visualization, and tasking, Locus is uniquely suited for the most complex or consequential operations, where accuracy and credibility cannot be compromised. Locus Technologies is headquartered in Silicon Valley, California. To learn more, visit www.locustec.com.
