PIMS software, a Pretreatment Information Management System, is how a publicly owned treatment works (POTW) runs its industrial pretreatment program. It tracks permits, industrial users, sampling results, inspections, violations, and the reports regulators expect, in one place. If your program still lives in spreadsheets, a shared drive, and an aging database, this guide is for you.
Here is the short version. Most pretreatment programs do not need another expensive standalone platform. The tools to run a modern, audit-ready program are very likely already in the Microsoft 365 environment you pay for. Below is what PIMS software does, what to look for when you evaluate it, and how a Microsoft-native approach compares to a costly legacy system.
What Is PIMS Software?
PIMS stands for Pretreatment Information Management System. It is the system of record for an industrial pretreatment program operated under the EPA National Pretreatment Program (40 CFR Part 403) and the Clean Water Act. A POTW uses it to manage the industries that discharge into its collection system and to demonstrate ongoing compliance to state and federal regulators.
A pretreatment program has many moving parts. PIMS software brings them together:
- Industrial user inventory: every permitted discharger, including categorical and significant industrial users (SIUs), with classification and history.
- Permits and limits: discharge permits, local limits, categorical standards, special conditions, and renewal dates.
- Sampling and monitoring: scheduled and special sampling events, analytical results, and automatic exceedance detection.
- Inspections and enforcement: field inspections, documented violations, and corrective actions tracked to resolution.
- Reporting: the annual pretreatment report and the complete records an audit will ask for.
One clarification worth making early. In the water and wastewater world, PIMS means pretreatment. It is not pipeline integrity management from the oil and gas industry, and it is not a LIMS. A laboratory information management system handles the lab analysis itself, while PIMS manages the compliance program and pulls those results in. If you are weighing a purpose-built program against a general document tool, see what is PIMS vs SharePoint.
Why Pretreatment Programs Outgrow Spreadsheets and Legacy Tools
Most programs start simple and grow until the tools cannot keep up. The warning signs are familiar:
- Permit renewals slip through the cracks. Expiration dates live in one person’s calendar, and a missed renewal becomes a compliance problem. A dedicated approach to industrial user permit management removes that risk.
- Exceedances get buried. Sampling results sit in spreadsheets, so a limit violation is noticed late instead of flagged the day the data arrives.
- Inspections are done twice. Field staff record findings on paper, then re-key everything at the office, which wastes time and introduces errors.
- The annual report takes weeks. Pulling a year of permits, samples, inspections, and enforcement actions together by hand is slow and stressful.
- Audits become a scramble. When a regulator asks for records, the answer should be one search, not a week of digging.
- Legacy systems are rigid and costly. Older standalone platforms lock your data in a vendor’s system and charge for every seat and change. Encina Wastewater Authority, for example, moved off a legacy pretreatment system to a modern, Microsoft-based approach.
These are not reasons to hire more staff. They are reasons to put the program on better software.
What to Look For in PIMS Software
Whether you build, buy, or modernize, judge any PIMS option against the capabilities a real pretreatment program needs.
Permit and Limit Management
A central repository for every discharge permit, with local limits, categorical standards, conditions, and automated renewal alerts. You should never miss a renewal or wonder which version of a permit is current.
Inspections and Enforcement
Mobile inspections that work offline in the field, configurable checklists by facility type, photo documentation attached to the record, and violation tracking that follows each issue through to a corrective action. This is the core of day-to-day pretreatment compliance software.
Sampling and LIMS Integration
Schedule routine and special sampling, import analytical results directly from your lab system, and flag exceedances automatically with a clear chain of custody. The system should connect to your LIMS rather than ask staff to retype results.
Reporting and Dashboards
Pre-configured regulatory reports, including the annual report, plus live dashboards that show program status at a glance. Good reporting turns days of preparation into a few clicks and gives leadership real visibility.
GIS and Spatial Context
Map industrial dischargers, sampling locations, and watersheds so you can plan inspection routes, see risk by area, and track spills or unauthorized discharges with spatial context.
Security, Permissions, and Audit Trails
Role-based access so the right people see the right records, plus a complete history of who changed what and when. Audit-ready documentation should be the default, not a special project. Related programs like FOG compliance and NPDES permit tracking ride on the same foundation.
Microsoft-Native PIMS: Use the Tools You Already Own
Here is where the build-versus-buy math changes. Most utilities and agencies already run on Microsoft 365. That means the platform for a modern pretreatment program is already paid for. A Microsoft-native PIMS, like the one Nexinite builds, runs inside your own tenant and gives you:
- Your data, in your environment. Records stay in your Microsoft tenant, not locked inside an outside vendor’s system.
- No forever licensing. You build on infrastructure you already own instead of paying per-seat fees on a separate platform.
- Field to boardroom. Mobile tools for inspectors and dashboards for managers, in one connected system.
- Integration with GIS, LIMS, and ERP. The program connects to the systems you already use.
- A familiar interface. Staff already know the Microsoft tools, so training and adoption are easier.
The result is a program built around how your team actually works, on a foundation you control. See the full Pretreatment Information Management System solution for how it fits together, and read the EPA pretreatment compliance requirements it is built to satisfy.
Pretreatment Information Management
Run your pretreatment program on the Microsoft tools you already own
Nexinite’s PIMS centralizes permits, inspections, sampling, and reporting inside your Microsoft environment. Your data stays in your tenant. No legacy platform, no forever licensing.
Build on Microsoft 365, Buy a Vendor, or Stay on Spreadsheets?
Most pretreatment programs are weighing three paths. Here is how they compare for a POTW running an industrial pretreatment program.
| Capability | Microsoft 365-native PIMS | Purpose-built vendor PIMS | Spreadsheets and email |
|---|---|---|---|
| Permits, limits, and renewals | Tracked with automated alerts in tools you already own | Built in, but on a separate platform | Manual, easy to miss |
| Field inspections | Mobile capture in Power Apps, offline ready | Native mobile app | Paper, re-keyed at the office |
| Sampling and LIMS results | Imported and auto-flagged for exceedances | Vendor integration | Copied by hand |
| Reporting and audits | Power BI dashboards plus a complete audit trail | Vendor reports | Compiled manually |
| Data ownership | Stays in your Microsoft tenant | Held in the vendor system | Scattered across drives |
| Cost | Uses licensing you already pay for | New per-seat licensing | Hidden cost in staff time and risk |
What to measure
Whichever path you choose, track a few numbers so you can prove the program improved:
- Time to produce the annual report: days or weeks before, hours after.
- Missed or late permit renewals: should trend to zero with automated alerts.
- On-time inspections: the percent completed by their target date.
- Time to find a record: seconds to pull a full compliance history for any industrial user.
What Good Looks Like
A well-run PIMS changes the daily experience of a pretreatment program:
- Permit renewals and sampling deadlines are tracked automatically, so nothing is missed.
- Exceedances and violations are flagged the moment data arrives, not weeks later.
- Inspectors capture findings once, in the field, and the office sees them immediately.
- The annual report and any audit request are a search, not a scramble.
- Leadership can see program performance in real time.
This is not theoretical. Encina Wastewater Authority replaced a legacy pretreatment system and automated its regulatory compliance and reporting on a Microsoft-based platform. You can read the Encina pretreatment compliance case study for the details.
How to Evaluate Your Readiness
If you are considering a change, a short assessment beats a big purchase. Start with these questions:
- Where does our program data live today, and who controls it?
- How long does the annual report take, and how much of it is manual?
- Could we produce a full compliance history for any industrial user in minutes?
- Are inspections still on paper, and are field and office working from the same record?
- What are we paying in licensing for a system that does not integrate with the rest of our tools?
The answers usually point in the same direction: the program needs a better system, and a Microsoft-native one can deliver it without a costly new platform.
Frequently Asked Questions
Is PIMS the same as a LIMS?
No. A LIMS manages laboratory analysis and produces results. PIMS manages the pretreatment compliance program (permits, inspections, sampling schedules, enforcement, and reporting) and integrates LIMS results into the compliance record.
Is PIMS the same as PIM software or a permit and inspection system?
The acronym is reused across industries. For water and wastewater, PIMS means Pretreatment Information Management System. You will also see PIMS used for permit and inspection management in government, and for project information management in capital programs. They share the same backbone of permits, inspections, records, and reporting, but this guide covers the pretreatment sense for POTWs.
Does PIMS only apply to large utilities?
No. Any POTW with an approved industrial pretreatment program manages permits, sampling, inspections, and an annual report. Mid-sized programs often feel the pain most, because the work is the same but the staff is smaller.
Can we really run pretreatment compliance on Microsoft 365?
Yes. The permit tracking, mobile inspections, sampling workflows, reporting, and audit trails a program needs can be built inside your existing Microsoft environment, with your data in your own tenant.
Next Steps
Your pretreatment program does not need another expensive platform. It needs the one you already pay for, configured for compliance. If you want to see what that looks like for your program, talk to the team that has done it for water and wastewater agencies.