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The Terradex Toolbox

Terradex’s product solutions rely on a flexible toolbox of data and services. Our data tools encompass a catalog of land activity and use data that is integrated into our technology solutions. Our services are proprietary applications built from our data collection and review processes. Terradex groups data and services into categories, and then describes the data or service, its relevance, and when applicable, the frequency of data updates. Our LandWatch, DigClean, and WhatsDown pages highlight the commonly used data sets and services applied in each stewardship solution.

Aligned with our customer-focused approach, Terradex is continuously innovating and developing new data sources and cutting-edge services to meet evolving client needs. In fact, responding to customer input is a cornerstone of our growth and how we continue to expand our catalog offerings. More details about Our Toolbox are below.

Data Sources

Excavation Activity

Excavation Clearance

Continuous stream of planned excavation events via direct feed from state One Call centers.

Continuous stream of planned excavation events via direct feed from state One Call centers.
Ordinarily compiled twice per day.


Public records of federal and/or state government permits for dredge or fill activities.
Identifies proposed dredging activities that could compromise or breach environmental remedies or ICs.
Ordinarily compiled monthly.

Street Opening Permits

Public records of local government permits issued for excavation, such as grading permits and street opening permits.
Identifies excavation, trenching, earth moving, and similar activities.

Ordinarily compiled weekly.

Real Estate Activity

For Sale Listings

Comprehensive real estate sales listing targeted to commercial and residential transactions.
Identifies potential land sales at identified environmental or IC sites.
Ordinarily compiled continuously (typically daily).

Property Transfer

Property records and tax assessor records from government and/or commercial sources.
Identifies the current owner and allows notice to new owners of institutional or engineering controls.
Ordinarily compiled monthly.


Public pre-foreclosure and foreclosure notices from commercial and/or government sources.
Identifies potential or recent foreclosure sales (foreclosure sales can “wipe out” recorded deed restrictions).
Ordinarily compiled weekly.


Public records of new utility (e.g., water, electricity) accounts and/or telephone listings, available from commercial and/or government sources for commercial and residential property.
Identifies new tenants and new occupants at identified environmental or IC sites.
Ordinarily compiled monthly.

Land Development

Building Permits

Public records of city or county building permit issuances, available from commercial and/or government sources.
Indicates new structure construction or existing structure modification.

Ordinarily compiled weekly.

Development Projects and Zoning

Public records from government and commercial sources as well as news sources related to development applications, construction bids, zoning variances, entitlements, and environmental reviews associated with land development projects.
Identifies excavation, trenching, earth moving, and similar activities.
Ordinarily compiled monthly.

Environmental Releases

Groundwater Plumes

Outer boundary line of area of impacted groundwater contamination. Attributes ordinarily include spill site name, link to spill site on agency websites, chemicals of concern, and NIOSH chemical hazard information.
Groundwater contamination can impact drinking water, and vapor intrusion from a plume can impact indoor air quality.

Spill Sites

Spill sites are releases collected from government agency databases. Spill site locations are displayed as either a point or polygon. Attributes include spill site information on agency websites, chemicals of concern, and NIOSH chemical hazard information.
Change Detection.


Other Data Sources

Sensitive Land Use

Public records of new occupancy licenses or other types of government approvals, available from commercial and/or government sources, for new childcare centers and schools (as well as hospitals and senior care in some jurisdictions).
Identifies proposed sensitive uses at or near environmental or IC sites (sensitive uses may comply with zoning but nonetheless jeopardize an IC).
Ordinarily compiled monthly.

Change Detection

Periodic targeted satellite imagery and then automatic change detection monitoring.
Identifies changes across land tracks including new structures, excavations and land disturbances. Provides record of site conditions.
Variable frequency as affected by weather.

Water Wells

Public records of water well permits and/or completion reports.
Indicates new groundwater use.
Ordinarily compiled monthly.

Remote Monitoring

Continuous monitoring of Vapor Extraction Systems (VES) performance using LandWatch remote monitors with status sent via cellular network. Adaptable to numerous use cases.
Maintains active remedy integrity by alerting to when distributed VES system fails.
Hourly updates to Terradex LandWatch.

Data Services

Affirmative Obligations

Keeps track of affirmative monitoring duties (e.g., inspections, certifications, notices, etc.) and sends reminders.

Institutional and engineering controls embed affirmative obligations for reporting, monitoring, and maintenance.
Obligations reviewed daily.

Custom Compliance Reporting

Summarizes and synthesizes LandWatch monitoring activity and results into tailored formats.
Regulatory compliance reporting requirements or similar purposes.
As needed.

Mobile Web

Terradex solutions can be viewed through a mobile device that directs the application to focus on the current location.
Provides clients with mobile access to their suite of Terradex web solutions from any location.


E-mail, PDF, or mailed Advisories sent from LandWatch to stakeholders, notifying of land activity or an event that potentially conflicts with site restrictions or site risks.
Stakeholder notification.
Automatic upon detection of land activity or manually by client as determined by client.

Mobile App Inspection

Mobile web application allowing for the collecting of notes, photos, videos, and signatures for use in the field when inspecting institutional or engineering controls.
Streamlines inspection and syncs with LandWatch monitoring results.
As determined for compliance or risk management.

Web Services

Content layers of Terradex data including land activity alerts, land activity events, parcel boundaries, and environmental content like spills, plumes, and institutional controls can be transmitted as a web service using common protocols associated with GIS (via WFS or WMS protocols) or web services (via JSON or RESTful services).
Terradex web services integrate into enterprise GIS systems and enterprise data systems, such as Salesforce or SAP.

Download Whats Down Capabilities

Download Dig Clean Capabilities

Download LandWatch Capabilities