Resource library
Field notes from building NPDESTracker.
These posts are workflow guides, field observations, and product thinking written while building NPDESTracker. The audience is the coordinators, inspectors, and program leads who actually run small Phase II MS4 programs. The goal is plain, useful writing on annual reporting, inspections, IDDE, public education, and audit-readiness, without marketing fluff.
For a topic-by-topic index of the workflow guides themselves (separate from these posts), see the stormwater software resources page.
Start here
Three posts to read first.
If you are new to the site, start here. One on whether you actually need software at all, one on what to look for in MS4 reporting software, and one on running an IDDE investigation cleanly.
Featured
Jan 21, 2026
When does a small MS4 program actually need compliance software?
An honest look at when a spreadsheet is fine, when it isn't, and what to look for when a Phase II program is ready to move to purpose-built MS4 software.
ReadFeatured
Apr 30, 2026
MS4 annual reporting software: a buyer's guide for small Phase II cities
What small Phase II cities should look for in MS4 annual reporting software. Why evidence-linked reporting matters, what 'submission' actually means in practice, and how to evaluate stormwater reporting software without overclaiming.
ReadFeatured
Mar 12, 2026
Handling illicit discharges from complaint to closure: a working playbook for MS4 coordinators
How to run an IDDE investigation cleanly: complaint intake, dry-weather screening, source tracing, enforcement, and closure. Documentation patterns auditors actually look for.
ReadAnnual reporting
Annual reporting and audit-readiness.
Why annual reports break in March, what evidence-linked reporting actually means, and how to evaluate stormwater reporting software without overclaiming.
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May 7, 2026
MS4 annual report checklist for Western Washington Phase II permittees
What to file, when to file it, and what auditors flag. A working checklist for Phase II MS4 permittees under the Western Washington permit.
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Apr 30, 2026
MS4 annual reporting software: a buyer's guide for small Phase II cities
What small Phase II cities should look for in MS4 annual reporting software. Why evidence-linked reporting matters, what 'submission' actually means in practice, and how to evaluate stormwater reporting software without overclaiming.
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Apr 23, 2026
NPDES Reporting Software: What MS4 Programs Need Before Annual Reports Are Due
Learn what NPDES reporting software should do for MS4 programs: inspections, IDDE, public education, outfalls, evidence linking, audit logs, and annual report preparation.
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Apr 2, 2026
MS4 Stormwater Software: What Small Cities Actually Need
What small Phase II MS4 programs actually need from stormwater compliance software. Why spreadsheets and PDFs break down, what to look for, and how a permit-aligned product replaces the ad hoc stack without overpromising.
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Mar 26, 2026
What small MS4 programs need from compliance software
A friendly look at what municipal MS4 programs actually need from compliance software. Why spreadsheets eventually break, what records have to connect, and what to ask before buying anything.
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Jan 27, 2026
How to make an MS4 program audit-ready (without rewriting your spreadsheets)
Audit-readiness isn't about cleaning up before the audit. It's about making the records audit-defensible day to day. A practical guide for MS4 coordinators.
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Jan 21, 2026
When does a small MS4 program actually need compliance software?
An honest look at when a spreadsheet is fine, when it isn't, and what to look for when a Phase II program is ready to move to purpose-built MS4 software.
Inspections and GIS
Inspections and GIS.
The field side of MS4 work. Inspection cadence, photo and GPS evidence, the inspection-to-record chain, and where ArcGIS and MS4 software each pull their weight.
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Apr 9, 2026
MS4 inspection software: what a small program actually needs from it
A friendly, practical guide to MS4 inspection software for municipal MS4 programs. What inspections are about, why spreadsheets get hard, what records should connect, and a short buyer checklist.
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Mar 19, 2026
MS4 software vs ArcGIS: why most municipal programs need both
ArcGIS and purpose-built MS4 compliance software solve different problems. A practical look at what each one does well, where they overlap, and how municipal stormwater programs use both together.
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Feb 10, 2026
Photo and GPS evidence on stormwater inspections: what auditors actually want to see
Field photos and GPS coordinates are some of the most valuable documentation an MS4 program produces, and some of the most commonly missing from the record. A practical guide to capturing inspection evidence that holds up in audit.
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Feb 3, 2026
Stormwater inspection cadence: monthly, quarterly, annual, and why it matters for your audit
Inspection frequency varies by program: construction, post-construction BMPs, outfalls, municipal facilities. A practical guide to the cadences that matter, and how cadence drift becomes audit findings.
IDDE and complaints
IDDE and complaints.
Complaint-to-closure playbooks, outfall screening, and how IDDE evidence feeds MCM 3 of the annual report.
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Apr 16, 2026
IDDE tracking software: what municipal MS4 programs actually need
What IDDE tracking software should actually do for a municipal stormwater program. The real workflow from complaint to closure, what to look for in a tool, and how IDDE evidence feeds the annual report.
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Mar 12, 2026
Handling illicit discharges from complaint to closure: a working playbook for MS4 coordinators
How to run an IDDE investigation cleanly: complaint intake, dry-weather screening, source tracing, enforcement, and closure. Documentation patterns auditors actually look for.
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Feb 18, 2026
Outfall inventory and dry-weather screening: a working MCM 3 guide for small MS4 programs
How small MS4 programs maintain an outfall inventory, run dry-weather screening on cadence, record indicator results, distinguish suspect flow from illicit flow, and feed the chronology into the annual report.
Public education and participation
Public education and participation.
Outreach, public meetings, comment periods, and behavior change campaigns.
The workflow side of these topics lives on the product pages below.
Source control, construction, and O&M
Source control, construction, and O&M.
Field inspections and recordkeeping for source control, construction sites, post-construction BMPs, catch basins, and maintenance assets.
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Mar 5, 2026
Tracking post-construction BMPs without losing them: a working guide for small MS4 programs
Why post-construction BMPs slip out of municipal inventories, what a clean BMP record looks like, and how to keep MCM 5 audit-defensible across staff turnover.
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Feb 26, 2026
Catch basin and drainage structure inspections: site work vs structure work, and how to keep both audit-defensible
Site inspections and structure inspections are different work, with different cadences and different documentation needs. A practical guide for MS4 programs to keep catch basins, inlets, manholes, and outfall structures defensibly inspected.
Want to see the product these posts came from?
The demo opens the main MS4 modules on sample data. The Guided Pilot runs NPDESTracker on a slice of your own program for 60 days.