Below is a list of frequently asked questions for AquaChem. If you have a question that isn’t listed here, please contact our technical support team (

PHREEQC will calculate saturation indices and activities for those parameters which are defined in your database. Also, the saturation indices will require that the PHREEQC component be mapped exactly as it is shown within AquaChem.
The PHREEQC database files distributed with the program are installed under My Documents AquaChem PHREEQC.
Yes, with AquaChem 2012.1 and later you can run the program completely on a Hydro GeoAnalyst (HGA) SQL database.
You can find the most up to date versions of the PHREEQC Graphical User Interface from the USGS website by selecting File>Preferences> PHREEQC, and clicking on the PHREEQC Website button.
MS Access 2007 is a prerequisite for the installation of AquaChem (version 2011.1 and higher). If this dependency is missing, you will receive the template message and a “[Warning!] ActiveX component can’t create object” error will occur. To correct this issue you will need to install the MS Access 2007 Runtime Engine directly from Microsoft Website:

The issue can be due to a missing system table in the database if the project was created using the advanced template. This can be fixed by following these steps:

  • Create a new project in AquaChem.
  • Open the project in MS Access.
  • Copy (ctrl+C) the table M_LinkedObjects from the list of tables.
  • Open the client project in MS Access.
  • Paste (ctrl+V) the table into the list of tables.
  • Save the changes in MS Access and open the project in AquaChem.

To create a new water quality standard, follow the steps below:

  • Open the Database options dialogue (File > Preferences), and select the Standards-Import tab.
  • Click the [+] Add button to create a new standard.
  • A blank Water Quality Standards dialog will load. Here you can: enter the name for this new set of standards, enter a reference for the new set of standards, enter a URL for the set of standards, enter the year that the standards were approved, and enter guideline levels for the new set of standards.
  • There are two ways to enter parameters and assign guideline levels: the values can be entered manually or the data can be imported from a file. Either way, data is entered for one guideline at a time.
  • Once finished, click the [Close] button.
To display the data on these plots, values must be present for all of the ions that you are trying to show on the plot. If even one of the ions does not have any values then your information will not be plotted. Right click on you parameter from the Sample Details screen, and double check if all parameters are available.
Please ensure that the plot symbols have been assigned correctly. This means that a separate symbol will represent each station in the project. You can confirm how the symbols are assigned by selecting Plots>Define Symbol or Line from the top toolbar. Ensure that Station is selected as the symbol grouping. If this is not available, you can add a new grouping for station id by selecting the […] button and adding a new grouping. Select this new grouping as the Symbol Group and then select Auto to automatically assign a symbol based on the station id. Alternatively, you can add only the stations you would like to view on a plot to the symbol grouping list. Once the symbol grouping has been selected and applied to the project, recreate your plot and select the stations you wish to view on the plot.