Every permit obligation has an owner, a deadline, and a documented record.
No MS4 obligation goes untracked, no deadline passes unnoticed, and no corrective action disappears into an email thread.
01 // MS4 STORMWATER COMPLIANCE
Stormwater compliance software for every obligation, asset, and audit
02 // Purpose-built Software
MS4 Stormwater Compliance Software for Water Utilities
Managing a MS4 Stormwater program means keeping track of multiple Minimum Control Measures simultaneously, each with its own inspection schedules, documentation requirements, corrective action timelines, and reporting obligations across departments, contractors, and the public. Locus MS4 Stormwater is not a standalone stormwater tool; it runs on the Locus Technologies cloud platform that also manages municipal drinking water and wastewater compliance across North America. When your entire water program runs on one system, stormwater compliance becomes something you can manage, not just survive.
Built on Locus Platform
Locus MS4 Stormwater is just one app on a multitenant, cloud-native platform that also runs Locus Wastewater Management, Drinking Water Quality, IPP/FOG, Backflow, and the full Locus EHS and ESG suite.
Stormwater inspection records, BMP tracking data, IDDE investigations, and water quality sampling results all flow into the same validated system your environmental team uses for NPDES reporting, spill management, and incident response. There is no re-entry, no reconciliation, and no separate vendor to call. The platform is self-configurable without writing code, so your team can adapt workflows, forms, and reporting templates to match your permit conditions without waiting for a vendor implementation cycle. The platform meets SOC 1 Type 2 and SOC 2 Type 2 standards (most stormwater software vendors do not hold SOC 1 Type 2 a certification) and protects compliance data with multi-factor authentication, single sign-on support, and encryption in transit and at rest.
Why choose Locus MS4 Stormwater software
MS4 compliance depends on dozens of recurring activities being completed, documented, and easy to retrieve. Locus gives every team a connected system for managing the work in the field and demonstrating it when regulators ask.
Create and configure inspection forms unique to your workflow.
Create and customize inspection forms to easily collect and track your data.
An illicit discharge report becomes an investigation, not a note on a whiteboard.
From the moment a complaint arrives, the program has a case file, an assigned coordinator, a screening schedule, and a documented path to closure.
Map your MS4 assets.
Create a GIS map of your stormwater infrastructure, inspection history, and maintenance records makes it possible to direct resources to the assets that actually create compliance risk.
The Annual MS4 Report does not require weeks of data assembly.
Every inspection, corrective action, sampling result, and enforcement record feeds the report directly from the system's live data.
The Locus MS4 Stormwater Workflow
06 // Lifecycle
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Organize
Map every MS4 permit obligation, assign it to a responsible party, and bring your stormwater asset inventory into one system of record with GIS coordinates, asset attributes, and inspection history from day one.
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Schedule
Configure recurring inspection schedules, sampling events, and compliance tasks across. Automated reminders ensure every deadline reaches the right person before it passes.
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Inspect
Field teams complete configured inspection forms, attached documentation, and close out records. Data syncs automatically. Corrective actions are assigned from the same workflow.
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Investigate and Enforce
IDDE complaints and dry weather screening findings open investigation workflows automatically. Enforcement notices and corrective action deadlines are tracked from issuance through documented resolution.
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Report
Quickly and easily generate data for your Annual MS4 Report, including MCM summaries and BMP performance reports. Every record feeding the report is traceable and audit ready.
Locus MS4 Stormwater simplifies compliance
07 // Feature Highlights
MS4 Permit and MCM Obligation Management
Keep track of your MS4 permit conditions in Locus software, create a list of customized Minimum Control Measure, and BMPs. The obligation registry covers all your MCMs with configurable task engines for annual, quarterly, and monthly recurring obligations.
Permit clauses connect to executed actions through an obligation-to-activity traceability framework. Every completed inspection, submitted report, and resolved corrective action links back to the permit condition it satisfies. The audit timeline view displays chronological compliance history by MCM, permit section, or date range. Evidence attachments including photos, reports, meeting logs, and sign-in sheets are stored against each obligation record.
Inspection Management
Locus gives field teams configured inspection forms for your MS4 inspection needs. Inspectors complete forms, capture photos, and tag GPS locations on site. Inspection history from prior visits is accessible on the same screen during an active inspection, so field staff can compare current findings against the last visit without leaving the form.
The drag-and-drop form builder supports conditional logic, compliance scoring thresholds, and mandatory field enforcement. Pre-built templates for common inspection types accelerate deployment for new programs or jurisdictions. Inspection scheduling is automated with recurring assignment logic and full status tracking. When an inspection result triggers a violation threshold, a corrective action or enforcement task is created automatically and routed to the responsible party.
IDDE Investigation and Enforcement
Illicit discharge investigations are managed as case files from first detection through closure. Screening logs capture pollutant indicators, field observations, and GPS-tagged outfall locations. When a screening result or incoming complaint indicates an illicit discharge, the investigation workflow opens automatically and assigns the case to the responsible coordinator. Parameter configurations cover nutrients, bacteria, metals, turbidity, and other regulated or monitored analytes. Threshold exceedance alerts notify responsible staff automatically. Trend charts and pollutant loading visualizations support watershed analysis and permit reporting.
Sampling events link directly to the IDDE case file. NOVs, compliance schedules, and corrective action deadlines are tracked with full communication logs covering all contacts and correspondence. Closure documentation and resolution audit trails satisfy state and EPA inspection requirements. Trend reporting surfaces recurring discharge locations and pollutant types over time, supporting both annual reporting and proactive program management.
GIS Mapping and Stormwater Asset Management
Locus GIS maps stormwater infrastructure inventory including outfalls, catch basins, and detention ponds, each carrying installation date, material type, ownership, drainage area. Asset records link directly to inspection history, maintenance history, and corrective action status. The Esri ArcGIS integration supports bulk import of your GIS data via GeoJSON, shapefile, or CSV for existing spatial data.
GIS & Spatial Intelligence
Annual Reporting and Audit Readiness
The Annual MS4 Report and MCM-specific compliance summaries generate directly from the system's live records. KPI dashboards display inspection completion rates, violation closure rates, BMP performance trends, sampling compliance, and public outreach documentation across all program areas in real time. Report templates are configurable to state-specific submission formats and export in PDF, Excel, and XML. A one-click audit packet assembles inspection records, enforcement history, corrective action documentation, sampling results, and public education activity logs into a complete regulatory submission package.
Secure cloud document storage with tag-based search, version control, and automated retention scheduling keeps program records organized and cross-linked to the inspections, assets, and permits they support. A public-facing transparency dashboard option supports community reporting obligations under the Public Involvement and Participation MCM.
Workflow Automation
The Locus workflow engine runs on a visual if-then rule builder. Inspection failures trigger enforcement tasks. Overdue corrective actions escalate to supervisors. Recurring compliance obligations assign automatically on schedule. Multi-step approval workflows, automated email and SMS notifications, and cross-departmental task assignment logic reduce manual oversight across a stormwater program of any size.
Performance metrics and risk scoring identify which assets and sites carry the highest compliance risk before an inspection is due. Budget forecasting dashboards connect compliance obligations to capital planning so program managers can defend infrastructure investment with data.
08 // Neno Duplan, Founder and CEO, Locus Technologies
"Utilities have struggled with fragmented, outdated, or single-purpose systems for too long.
That's why Locus Water is a game-changer for water pros trying to keep up with everything from DMRs, CCRs, PFAS, and compliance to cybersecurity and customer outreach."
09 // Truly Unified Platform
One solution on a platform built for your entire water, EHS, & ESG program
MS4 stormwater tools have existed for two decades. What has not existed until now is one that shares a common data model with a municipality's wastewater NPDES program, its drinking water quality records, its spill management workflow, and its ESG reporting.
11 // One System of Record
Stormwater compliance history — always at your fingertips
Every staff record, asset profile, inspection history, and permit obligation entered into Locus MS4 Stormwater is immediately available to every other Locus app the municipality runs. That is not integration. That is the same platform. Dedicated MS4 tools manage stormwater. Locus manages stormwater and every other program your municipality runs, on one governed platform, with one audit trail.
MS4 permits run for five years and carry compliance histories that regulators expect to trace back for decades. The inspection records, enforcement documentation, IDDE case files, and sampling datasets that a program accumulates over its life need to live in a system that survives personnel transitions, reorganizations, and vendor changes without degradation. When that history lives in Locus, it is governed, backed up, and accessible to the next program manager from day one.
11 // Software Demonstration
Your MS4 program deserves better than a collection of spreadsheets
See how Locus MS4 Stormwater manages permit obligations, inspections, IDDE investigations, sampling, and annual reporting in one cloud platform, connected natively to your wastewater, drinking water, and EHS programs.
Schedule Your Personalized Demo
Frequently Asked Questions
12 // FAQ
Yes. The drag-and-drop form builder supports conditional logic, scoring thresholds, mandatory fields, and jurisdiction-specific language. Pre-built templates are available for IDDE dry and wet weather screening, construction site inspections, post-construction BMP assessments, and good housekeeping municipal operations. Forms are modified without writing code, and different forms are assigned to different inspection types, permit programs, or geographic areas within the same system.
Locus MS4 Stormwater runs on the same platform as Locus Wastewater Management, Drinking Water Quality, Industrial Pretreatment, and Cross-Connection Control. Stormwater data is immediately accessible to every other Locus app the municipality runs. No export, no reconciliation, and no explanation owed to auditors about which number is correct.
Insights, updates, and expert guidance
13 // Recommended Reading
