Guidance for Slope Calculations and Domestic Well Notifications

When updating your ranch eNOI (see item 1 – Important Upcoming Compliance Dates/Tasks), you will encounter the question, “What is the highest percent slope of the irrigated acres on the ranch?”. Please review the guidance document on calculating slope from the Water Board, Appendix A: Slope Reporting Guidance.

Generally, to calculate your ranch’s slope, you should identify the highest elevation point and lowest elevation point on your ranch, and the distance in between:

SLOPE = {(Max Elevation – Min Elevation)/Distance Between} x 100

If you have a more complex ranch and are having difficulty applying the Slope calculation or interpreting the Water Board’s guidance document, please contact the Water Board staff at

When updating your ranch eNOI, you will also encounter a section regarding Drinking Water Notification Confirmation. Under Ag Order 4.0, notifications to well users must be issued EVERY YEAR, within 60 days of receiving your annual well sampling report(s) from Preservation, Inc. (contact or (831) 761-8644 if you are having trouble locating a well sampling report).  If you have concerns about answering “No” or “N/A” in this section of the eNOI form, you should email to request written confirmation that these responses are acceptable.

Contact Info

  • PO Box 2227
    Watsonville, CA 95077
  • 831-761-8644 (phone)
  • 831-761-8695 (fax)
For a full list of contacts please
visit our contact page.

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