# Construction dewatering software that turns daily turbidity readings into a weekly average you can act on

> Construction dewatering is the removal of groundwater or accumulated water from an excavation so work can continue, and discharging that water needs permit coverage because it carries sediment. Under the 2022 EPA Construction General Permit the turbidity benchmark is 50 Nephelometric Turbidity Units, sampled at least once a day from each discharge point and compared as a weekly average, with results reported quarterly through NeT-CGP. Neurobird keeps the samples, the averages and the corrective actions on one log.

- URL: https://neurobird.com/dewatering/
- Product: Neurobird Construction Dewatering Compliance Platform
- Niche: construction dewatering
- Buyer: dewatering contractors
- Status: in development, open for early access
- Updated: 2026-08-21

## What Neurobird Construction Dewatering does

- Log a turbidity sample per discharge point per discharge day, with time, technician and reading
- Compute the weekly average against the benchmark as results arrive, not at the end of the quarter
- Trigger and record corrective action when the weekly average goes over, with the date it was completed
- Assemble the quarterly submission from the logs rather than from a stack of field sheets

## How it works

1. **Log at the discharge point** Time, technician, reading and the discharge point, captured on the day the discharge happens, with the rain gauge reading alongside it.
2. **Watch the weekly average** Readings roll into the weekly average against the benchmark, so an exceedance is visible in the week it occurs rather than at reporting time.
3. **Close the loop** Corrective action is recorded against the week that triggered it, and the quarterly submission is assembled from the same logs.

## From the source material

> Report all weekly average turbidity monitoring results on a quarterly basis via NeT-CGP no later than 30 days following the end of each monitoring quarter.

Source: US EPA, turbidity benchmark monitoring for dewatering, https://www.epa.gov/npdes/turbidity-benchmark-monitoring-dewatering-under-construction-general-permit

## Industry context

- **50 NTU** The turbidity benchmark threshold under the 2022 Construction General Permit is 50 Nephelometric Turbidity Units unless an alternative benchmark is approved by EPA. (source: US EPA, turbidity benchmark monitoring, https://www.epa.gov/npdes/turbidity-benchmark-monitoring-dewatering-under-construction-general-permit)
- **1 sample** Sites discharging dewatering water to a sediment impaired water, or to a water designated Tier 2, Tier 2.5 or Tier 3, must collect at least one turbidity sample per day from each discharge point on any day there is a dewatering discharge. (source: US EPA, turbidity benchmark monitoring, https://www.epa.gov/npdes/turbidity-benchmark-monitoring-dewatering-under-construction-general-permit)
- **30 days** Weekly average turbidity results are reported on a quarterly basis through NeT-CGP no later than 30 days following the end of each monitoring quarter. Exceeding the weekly average benchmark triggers follow up corrective action under CGP Part 5.2.2. (source: US EPA, turbidity benchmark monitoring, https://www.epa.gov/npdes/turbidity-benchmark-monitoring-dewatering-under-construction-general-permit)
- **1 acre** A Clean Water Act permit is required for stormwater discharges from construction disturbing 1 acre or more of land, or less than 1 acre where the work is part of a common plan of development that will ultimately disturb 1 or more acres. (source: US EPA, stormwater discharges from construction activities, https://www.epa.gov/npdes/stormwater-discharges-construction-activities)
- **1.0 inch** North Carolina's NCG01 general permit requires that when a storm event of 1.0 inch or greater occurs outside normal business hours, the self inspection is performed at the commencement of the next business day, and daily rainfall amounts are part of the inspection record. (source: NC DEQ, NCG01 inspection and reporting, https://www.deq.nc.gov/energy-mineral-and-land-resources/stormwater/npdes-general-permits/ncg01-inspection-record-keeping-and-reporting-2024/open)

## Pricing

- Single site: $120 per site, per month
- Contractor: $310 per site, per month
- Multi project: $560 per site, per month

## Questions

### What is construction dewatering?

Construction dewatering is the removal of groundwater or accumulated surface water from an excavation so work can proceed. Because that water usually carries sediment, discharging it needs permit coverage. Under the 2022 EPA Construction General Permit, sites discharging dewatering water to sensitive waters must monitor turbidity against a benchmark.

### What is the turbidity benchmark?

The turbidity benchmark under the 2022 Construction General Permit is 50 Nephelometric Turbidity Units, unless EPA approves an alternative. It applies to sites discharging dewatering water to a sediment impaired water or to a water designated as Tier 2, Tier 2.5 or Tier 3.

### How often do we sample and report?

Collect at least one turbidity sample per day from each discharge point on any day there is a dewatering discharge, then compare the weekly average against the benchmark. Weekly average results are reported quarterly through NeT-CGP no later than 30 days after the end of each monitoring quarter.

### When does a construction site need a permit at all?

A Clean Water Act permit is required for stormwater discharges from any construction activity disturbing 1 acre or more, or less than 1 acre where the work is part of a common plan of development that will ultimately disturb 1 or more acres.

### Does this replace our project management system?

No. Schedule, cost and submittals stay where they are. What lives here is the discharge record: samples, weekly averages, rainfall, corrective actions and the report that came out of them.

## Sources

- [US EPA, turbidity benchmark monitoring for dewatering](https://www.epa.gov/npdes/turbidity-benchmark-monitoring-dewatering-under-construction-general-permit)
- [US EPA, 2022 Construction General Permit](https://www.epa.gov/npdes/2022-construction-general-permit-cgp)
- [US EPA, stormwater discharges from construction activities](https://www.epa.gov/npdes/stormwater-discharges-construction-activities)
- [NC DEQ, NCG01 inspection, record keeping and reporting](https://www.deq.nc.gov/energy-mineral-and-land-resources/stormwater/npdes-general-permits/ncg01-inspection-record-keeping-and-reporting-2024/open)

## Contact

- office@neurobird.com
- https://neurobird.com/