Fast entry
Big number fields, a Next key, and drafts saved as you go. Today's rounds show as Due, Overdue or Completed.
For iPhone
Ditch the clipboard.
Every round, on the record.
The daily operating log for small water systems. Log chlorine residual, source meter, pressure and pump hours in a few taps; catch an out-of-range reading before you submit; keep every correction on the record; and hand the inspector a clean PDF.
Built for the daily round
Everything the paper log does. None of the guessing.
For people who take daily readings at wells, treatment, tanks and meters: mobile home parks, RV parks, campgrounds and similar small systems.
Ranges you set
Give any numeric reading a min and max. A low residual or a slipped decimal is flagged before you submit, never blocked.
Corrections on the record
Fix a submitted round with an optional reason. The original value, the new one and the time are kept in its Edit History.
PDF and CSV reports
A clean PDF for the inspector or owner, a Detailed CSV and a Round Summary CSV. Share to Files, Mail, AirDrop or a printer.
Trends
Chart any numeric reading or meter usage over 30 days, 90 days, a year or all time, with your limits marked.
Reminders
Optional notifications at each round's due time, skipped when the round is already recorded.
Every site you run
Multiple sites, operators and sample locations, with your own rounds and custom readings in your own units.
Meter usage, worked out
Usage is calculated from the previous reading. Mark a meter reset or rollover and that interval is left out, not guessed.
Dark mode
Full dark mode for a dim well house or a night call-out, and text that scales with Dynamic Type.
Private by design
No account. No server. No tracking.
Your records live on your iPhone. They leave it only when you share a report or save a backup.
- Works offline. Record a round with no signal in the pump house.
- No analytics or ads. The app contains no third-party tracking code.
- Your backups, your place. Save a backup file to Files or iCloud Drive and restore it on this iPhone or a new one.
- Values keep their precision. 0.70 stays 0.70, and each record shows the time zone it was taken in.
Pricing
Free to start. Every feature included.
Your first 7 submitted rounds are free. After that, Premium lets you keep submitting rounds.
Free
$0
Your first 7 submitted rounds, with every feature. View, correct, export and back up your records any time, with or without a subscription.
Premium monthly
$4.99 / month
Unlimited rounds. Auto-renews monthly until cancelled.
Premium annual
$39.99 / year
Unlimited rounds. Auto-renews yearly until cancelled.
Prices shown in US dollars; the app and the App Store show the current price in your local currency. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the end of the current period. Manage or cancel any time in your Apple Account settings. See the Terms of Use and Privacy Policy.
Water System Logbook is a record-keeping tool. It doesn't judge whether a reading meets any regulation; the only ranges are the ones you set. Reports are not official forms.