Water and wastewater utilities
Report compliance data your utility can defend.
PFAS, disinfection byproducts, volatile and synthetic organics. Every result your utility reports traces back to a calibration. WLTR shows every candidate model side by side and objectively identifies the best fit, so your lab can stand behind the numbers regulators, public health officials and ratepayers act on.
Why labs switch to WLTR
Review a full PFAS or VOC calibration at once, not one compound at a time.
Chromatography data systems were built to acquire and process data, not to judge a calibration. WLTR does that job objectively, for every analyte, in one view.
- Your CDS shows one analyte at a time, on one small screen.
- Curves are checked by hand, analyte by analyte, often in a spreadsheet.
- The model is chosen by whoever processed the batch, often a junior analyst.
- QA directors sign off without an objective basis for the curve that was chosen.
- Every analyte and every candidate model on one screen, in the Calibration Intelligence dashboard, with multi-analyte visibility.
- Every curve is checked automatically, including accuracy at the minimum reporting level.
- The best fit is determined objectively: same data, same answer, every time.
- QA directors review exceptions only, with one unified calculation behind every calibration.
Hours back every batch
Review by exception instead of one analyte at a time.
Peace of mind for QA
An objective, documented basis for every curve that is signed off.
Accurate data for regulators
Results built on the best-fit calibration, not on habit.
More capacity, less outsourcing
Faster review frees analysts to bring more testing in house.
What WLTR adds to your data
A passing calibration is not the same as the right calibration.
Utility labs run regulated methods with small teams, and calibrations are usually checked against a pass or fail flag rather than examined compound by compound. WLTR independently evaluates your calibration standards, ranks how well each established model fits, and documents the result for every analyte on every instrument.
The right fit, backed by evidence
WLTR evaluates the candidate calibration models side by side, so the option your lab reports for each analyte is supported by data rather than habit or software defaults.
Accuracy where compliance is decided
Results are judged against maximum contaminant levels, minimum reporting levels and permit limits. WLTR checks every calibration level, including low-end accuracy, so bias near a limit surfaces before a result is reported.
Every compound, every instrument
PFAS, VOC and SOC methods quantitate dozens of compounds per run. See which compounds and instruments struggle, and trend them over time. Multi-analyte oversight
Records that stand up to review
A documented, reproducible calibration evaluation supports state drinking water certification, NPDES compliance reporting and on-site audits. Audit defensibility
See it for yourself
Same calibration. Three models. Three different answers.
Switch the calibration model and watch how accurately each standard recalculates. The unweighted linear fit posts an r² above 0.998 and still misses badly at the low end, right where minimum reporting levels and maximum contaminant levels live.
How to read this: each dot is one calibration standard. The closer to the center line, the more accurately that standard is recovered. Pick a regression model:
Recalculated accuracy of each calibration standard. Shaded band shows an example ±20% acceptance window; your method and SOP set the actual criteria. Illustrative data.
Inside WLTR
From ICAL export to a defensible record.
Step 01
Upload the calibration straight from your data system.
Drop in the calibration export from your GC-MS or LC-MS/MS data system. WLTR parses the run and confirms instrument and method context. Nothing about how your instruments acquire or process data changes.
Step 02
Compound lists, mapped once.
PFAS and VOC names rarely match across instruments, software and methods. WLTR maps every analyte to a consistent name so results can be trended across runs and instruments.
Step 03
Every compound, every model, side by side.
WLTR fits each analyte against the candidate calibration models and shows how accurately every standard recalculates, so curvature and low-end bias are visible at a glance.
Step 04
A ranked, documented recommendation.
All 19 acceptance criteria roll up into a ranked model comparison with a clear recommendation and the evidence behind it, ready for data review and your data package.
Your CDS remains the system of record. WLTR is the system of verification. WLTR complements your accredited methods. It does not replace your CDS, your LIMS, or your method SOPs. The WLTR methodology is patented (US 12,038,448 B2).
Where calibration risk hides
The calibration problems water and wastewater labs live with.
Small teams, regulated deadlines
A few analysts cover analysis, review and reporting, so calibrations get checked against a pass or fail flag rather than examined.
Matrix effects across sample types
Influent, effluent and biosolids behave differently. A calibration that fits clean water can bias results in a dirty matrix.
Low standards near MCLs
With PFOA and PFOS limits at 4 parts per trillion, a low standard that fails to recalculate puts compliance results in question.
Quadratic fits used to rescue a curve
Switching to a quadratic can make a calibration pass while masking detector saturation or a failing standard.
Reruns and missed holding times
Recurring calibration failures cost reanalysis, and a missed holding time means resampling.
Public scrutiny
A result that triggers a violation, a public notice or a permit action will be scrutinized. The calibration behind it needs to hold up.
How it works
Three steps. No change to your methods.
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Export
Export calibration data from your chromatography data system.
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Evaluate
WLTR fits your standards against the candidate calibration models, scores each one, and ranks model performance for each analyte.
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Review and document
Analysts, data reviewers, and QA receive a clear verification result per analyte and instrument, ready for data review, compliance reporting, and audits.
Regulatory alignment
Built around the standards your lab is assessed against.
| Framework | What it covers | How WLTR supports it |
|---|---|---|
| Safe Drinking Water Act (40 CFR Part 141) | National primary drinking water regulations, including maximum contaminant levels and approved analytical methods. | Calibration evidence behind every compliance result reported to the state. |
| 40 CFR Part 136 | Approved test procedures for Clean Water Act and NPDES permit monitoring. | Recalculated accuracy and residual checks for each analyte in the calibration. |
| EPA drinking water laboratory certification manual | The criteria states use to certify laboratories that analyze drinking water. | Documented, reproducible calibration records for on-site certification audits. |
| EPA Methods 533, 537.1 and 1633 | PFAS methods for drinking water, and for wastewater and biosolids. | Compound-level calibration review across the full PFAS list. |
Who it is for
Built for the people who sign the report.
- Laboratory supervisors
- Quality assurance officers
- Chemists and analysts
- GC-MS and LC-MS/MS operators
- Data reviewers
- Compliance and regulatory staff
Questions
Frequently asked questions
Does WLTR replace our CDS or LIMS?
No. Your chromatography data system remains the system of record and your LIMS continues to manage samples and reporting. WLTR is a verification layer that evaluates the calibration data your instruments already produce.
Does WLTR support state certification and NPDES reporting?
WLTR gives your lab a documented, reproducible evaluation of each calibration, including how the model you report compares with alternatives and how accurately each standard recalculates. That record supports the calibration questions certification officers and permit auditors ask.
Which methods does WLTR work with?
Methods that quantitate against a calibration curve, including PFAS by EPA 533, 537.1 and 1633, volatile organics by EPA 524.2 and 624, semivolatiles and pesticides by EPA 525.3 and 625, and disinfection byproducts by GC.
Do we have to change our methods or SOPs?
WLTR works from calibration data you export after a run. It does not change how your instruments acquire or process data. How WLTR results are referenced in your SOPs is decided by your quality system.
How do we get started?
Apply to the WLTR Pilot Program or request a demo. We will review your workflow and show how WLTR evaluates calibrations from your own instruments.
Pilot program
See what WLTR finds in your compliance calibrations.
Bring a recent calibration. We will show you how each analyte’s reported calibration compares with the best-fit model.
References: 40 CFR Part 136 · 40 CFR Part 141 · WLTR Standards Hub