Introduction
Using the On-site App for sampling is mandatory as of November 1, 2024; as a consequence, when generating Clearstream to submit the test results in the ZDHC Gateway, you must include the On-site App project number (e.g. O-P-0000).
On-site App projects must be created before the sampling date (we strongly recommend doing this at least one week in advance). This allows sufficient time to complete the necessary steps, finalise pre-visit documentation, and prepare for on-site activities without delays. The supplier is responsible for initiating the ClearStream request in the ZDHC Gateway.
The Supplier organisation must be fully registered on the ZDHC Gateway before creating the project and initiating the sampling process.
Please note that projects created after the sampling date will not be considered compliant with our protocols.
Note: With the ZDHC Gateway relaunch, if sampling has already been initiated and completed in the On-Site app without a corresponding request in the ZDHC Gateway, the supplier must still submit the request in the ZDHC Gateway before a ClearStream Report can be generated.
Once the request has been submitted, you can use the sampling data already collected, together with the On-Site app project number, to submit the test results.
You can find more information about this process in the Knowledge Base.
1 - Project creation
When a Supplier needs Wastewater Sampling performed at their facility, they can request this through the ClearStream process in the ZDHC Gateway.
Note: With the relaunch of the ZDHC Gateway in August, 2026, some disruption can be expected between the On-Site App and the ZDHC Gateway data as we continue to enhance the platform and enable new functionalities.
IMPORTANT: Only Suppliers fully registered in the ZDHC Gateway can be assigned to a project; check the Supplier status before planning the service.
2 - Project assignment to an Expert
The Solution Provider assigns the project to a qualified Sampler* in the Solution Provider Platform by clicking on Assign Expert in the Service Request section.
The Sampler receives a notification and can access the project directly in the On-site App.
(*A qualified Sampler is a staff member who has been nominated, completed the training, and passed the exam for the relevant service.)
3 - Project completion
The Sampler follow these steps to complete the project:
Step 1: Go to the On-site app
Step 2: Log in with your credentials
Step 3: View and download relevant forms (You may use your forms as long as all the required data are present)
Step 4: Verify/Create sampling points
For facilities previously sampled with the On-site App (by yours or another laboratory): Sampling points already exist. Ensure the list of sampling points is complete, confirm by uploading proof and create any missing sampling points if necessary.
For facilities' first On-site app sampling: Create the sampling points during the previsit and add coordinates and proof pictures during the on-site visit.
Step 5: Click on “Start”
Step 6: Select accurate discharge options
IMPORTANT: ensure the choice is correct before saving it; this will be reflected in the sampling procedure; ask the supplier for documental confirmation to avoid any issues
Step 7: Complete the previsit following the instructions
Step 8: Complete the on-site visit following the instructions and create SAMPLING POINTS, SAMPLES, and INSTRUMENTS
Step 9: Close the project, indicating the on-site date (if you have a connection issue, you can close the project as soon as possible, indicating the correct on-site date even if it is in the past)
4 - Troubleshooting
LACK OF CONNECTION ON-SITE:
Gather all the necessary evidence as outlined in the previsit and input the necessary information as soon as you have a connection. You will be able to close the project with the correct on-site visit date.
DISCHARGE TYPE IS DIFFERENT FROM SUPPLIER’S INDICATIONS:
Samplers are asked to select the correct discharge type and volume at the project start; we advise asking the supplier to provide evidence to confirm the type and volume of discharge.
Ensure the choice is correct before saving it; this will be reflected in the sampling project.
Samplers are asked to confirm the discharge type and volume when arriving on-site.
If the type of discharge is incorrect, get in touch with your laboratory to evaluate if you should move forward with the sampling (e.g. the sampling collection kit may not be adequate)
If there are no conditions to complete the sampling, cancel the project (providing the motivation) and organise new sampling for the facility.
If it is possible to complete the sampling, cancel the project (providing the motivation) and create a new project with the correct discharge type.
IMPORTANT: Ensure the type of discharge is correct in the ZDHC Gateway