Privacy
Privacy Policy
Last updated 9 August 2026
Mayvil is a private field application used by municipal stormwater and environmental compliance staff. It is not a consumer product and is not offered to the general public. This policy explains what the app collects, why, and who it belongs to.
Who controls your data
Inspection records created in Mayvil belong to the jurisdiction that issued your account. That agency is the controller of those records; Tewms LLC operates Mayvil on its behalf as a service provider and handles the data only to run the app and to support the agency.
What Mayvil collects
- Account information — your name, work email, jurisdiction, and role, as issued by your agency.
- Inspection content — the observations, findings, ordinance citations, and signatures you record.
- Photos and media — images captured during an inspection, including any metadata the camera attaches.
- Location — the coordinates of sites and outfalls you inspect, recorded so findings can be tied to a place on the map.
- Dictation — audio you record hands-free and the text transcribed from it.
- Device and diagnostic data — app version, iOS version, device model, and error reports used to diagnose crashes and sync failures.
How it is used
Collected data is used to create and store inspection records, sync them between your device and your agency’s account, produce MS4 and other compliance reporting, respond to your support requests, and keep the app secure and working correctly. Mayvil does not sell personal information, does not share it with advertisers, and does not use inspection content for advertising or profiling.
Offline storage on your device
Because field work happens outside coverage, inspections are written to your device first and stored there until they sync. That local copy is protected by your device’s own encryption and passcode, which is why devices used for inspections should have a passcode enabled and should be reported to your agency if lost or stolen.
Jurisdiction isolation
Records are partitioned by jurisdiction. Users signed in under one agency cannot read or export another agency’s inspections.
Service providers
Mayvil runs on Google Cloud and Firebase, which host the application and store synced records on our behalf. Providers are used only to deliver the service and are not permitted to use agency data for their own purposes.
Retention and deletion
Inspection records are public records of the issuing agency, and retention is set by that agency’s schedule and applicable Texas records law — not by us. Agencies can request export or deletion of their data at any time. Individual users should direct requests about their own account to their program manager.
Security
Data is encrypted in transit and at rest, access is limited to the staff who need it to operate and support the service, and accounts are issued and revoked by each jurisdiction. No system is perfectly secure, but suspected incidents affecting agency data are reported to the affected agency.
Children
Mayvil is a workplace tool for municipal staff. It is not directed to children and does not knowingly collect information from anyone under 13.
Changes to this policy
If this policy changes, the date at the top is updated, and material changes are communicated to participating jurisdictions.
Contact
Questions about this policy, or requests to access, correct, export, or delete data, can be sent to hello@grifowater.com.