Montana EQuIS Water Quality Exchange (MT-eWQX) Support

This site provides guidance for submitting water quality data to Montana DEQ’s MT-eWQX database. MT-eWQX is DEQ’s main repository for storing water quality monitoring data, which includes physical, chemical, biological, and habitat data from a variety of projects across the state. Data submitted to MT-eWQX gets submitted to EPA’s National STORET Warehouse, which fulfills the STORET requirement of environmental monitoring projects funded by federal monies, such as 319 grants or 106 funds.

If you need assistance during the EDD submittal process, contact Jolene McQuillan.

MT-eWQX ListServ Receive important updates about MT-eWQX, including when updated reference value lists are posted, anticipated outages for maintenance, or training opportunities.

Step 1: Prepare Your EDD

Environmental monitoring data must be submitted to MT-eWQX in a specific format. Data providers are required to download the MT-eWQX EDD and populate it with their project’s data. Detailed guidance for populating the MT-eWQX EDD can be found in the MT-eWQX Guidance Manual.

Data submittals in specific response to the department's biennial 'Call for Data' supporting water quality assessments have a specific guidance manual, which is provided below.


MT-eWQX Guidance Manual

MT-eWQX Guidance Manual - Call for Data


STORET to WQX Characteristics with Method Speciation

Step 2: Validate Your EDD

After Step 1 is complete, your MT-eWQX EDD is ready for data validation using the EQuIS Data Processor (EDP). The EDP is a standalone application that allows data providers to check their EDD files prior to submission to ensure they are formatted as described in the MT-eWQX Guidance Manual. If the EDP detects errors, the errors will be identified and most can be corrected directly within the EDP. After the errors are corrected, the EDP must be re-run to ensure that no errors remain. Your EDD must have a clean validation from the EDP prior to data submission to DEQ.

Download EDP

EDP Guidance Manual

Step 3: Submit Your EDD

After Step 2 is complete and your EDD has no errors, you’re ready to submit your EDD to MT-eWQX. In order to submit an EDD, you must have an:

Information about all the above requirements can be found within the MT-eWQX Guidance Manual.

Follow the link below to submit your EDD to MT-eWQX (send file to Jolene McQuillan):

Additional Information

To access data submitted to MT-eWQX, go to EPA’s Water Quality Portal. The following link provides guidance on how to download data from the Portal: Water Quality Portal Guidance Manual.

The following field forms are provided by DEQ to assist with project data management:

Information for Laboratories

Laboratory MT-eWQX EDD: This link is provided to assist laboratories in producing a MT-eWQX compatible EDD. The requirements provided in this document are specific for laboratories and should not be used by data providers submitting data to DEQ.

NEW for 2017: We are now requiring labs report both the Method Detection Limit (MDL) and Lower Reporting Limit (LRL) for each result. We are requiring the MDL value as defined by EPA (40 CFR Appendix B to Part 136). For the LRL, we are asking for the value the lab defines as their lower limit of quantitation. This varies between labs and may be a multiple of the MDL or the lowest point on the calibration curve, among others.

The following templates are provided by DEQ to assist labs in producing a MT-eWQX compatible EDD:

Reporting Requirements for Chemistry Results

Final analytical reports must conform to the Department's SOP WQPBDMS-10 Rev. 2 - Minimum Reporting Requirements for Analytical Data (Chemistry) for the Water Quality Planning Bureau