Central Valley farmers, irrigation managers, and California growers are critical in sustainable agriculture. But with increasing concerns about water quality and nitrate contamination, compliance with state regulations has never been more vital. That’s where the Irrigation and Nitrogen Management Plan (INMP) comes in.
This post breaks down what INMP is, why it matters, its compliance requirements, and how to simplify the process with available resources. By the end, you’ll have the clarity and tools to meet California’s legal standards while promoting environmental sustainability.
Table of Contents
What is an INMP, and Why Does it Matter?
What is INMP?
An Irrigation and Nitrogen Management Plan (INMP) is a comprehensive strategy developed by farmers to efficiently manage water and nitrogen fertilizer on irrigated parcels of land. The goal is to enhance nitrogen use efficiency while reducing the risk of nitrate leaching into groundwater and surface water.
Why is it important?
Agricultural nitrate leaching is a significant issue in California, especially in the Central Valley, where farming intensities are high. Too much nitrogen enters groundwater can contaminate drinking water sources and harm aquatic ecosystems. Complying with the INMP helps farmers protect crucial water resources, minimize waste, and stay ahead of regulatory violations.
INMP Requirements and Compliance
Who needs an INMP?
All farmers irrigating land within California’s Central Valley must develop an INMP for each irrigated parcel of land they manage. This applies to members of regional coalitions as well as independent operators.
INMP Summary Report Submission
Farmers are required to submit an INMP Summary Report annually. This report pulls information from the INMP Worksheet and captures details like crop types, irrigation methods, nitrogen application rates, and water quality practices.
- Coalition Members: If you belong to an approved third-party organization like the East San Joaquin Water Quality Coalition (ESJWQC), you can submit your INMP Summary Report through the coalition.
- Independent Operators: Growers complying individually with Ag Order 4.0 requirements must upload their INMP Summary Reports to GeoTracker, the Water Boards’ online reporting system.
High Vulnerability Areas (HVA)
If your farm operates in a High Vulnerability Area (HVA)—regions identified for their heightened risk of nitrogen leaching—your INMP must be certified. Certification can be achieved in two ways:
- Self-certification by completing a CDFA-approved training program.
- Certification by a Certified Crop Advisor (CCA) with a Nitrogen Management Specialty from CDFA.
Farmers in HVAs should prioritize proper certification to avoid penalties.
Resources to Simplify INMP Compliance
Navigating INMP requirements doesn’t have to be overwhelming. Here are key tools and resources to streamline your efforts.
CDFA Training Programs
The California Department of Food and Agriculture (CDFA) offers in-depth training for Certified Crop Advisors (CCA), who assist farmers with nitrogen management planning. Completing this training ensures your INMP meets state standards, especially in HVAs.
East San Joaquin Water Quality Coalition (ESJWQC) Templates
For farmers partnered with the ESJWQC, pre-approved templates for INMP Worksheets and Summary Reports are available. These templates simplify irrigation and nitrogen use, ensuring consistent and compliant record-keeping.
GeoTracker Submission System
Independent growers must submit their INMP Summary Report via the GeoTracker online platform. This system keeps your submissions organized and accessible for regulatory inspections. Visit the Water Boards’ GeoTracker website for submission guidelines.
Irrigated Lands Program
The Irrigated Lands Regulatory Program (ILRP) is a valuable resource for additional guidance on record-keeping, reporting, and monitoring requirements. Their website offers detailed information to help farmers comply with water quality laws.
INMP FAQs
1. What crops require an INMP?
Regardless of the crops grown, all irrigated parcels require an INMP if they are located within designated regulatory areas in California.
2. Do I need an INMP if I use drip irrigation?
Yes. While drip irrigation reduces the risk of nitrate leaching, you must submit an INMP to demonstrate proper nitrogen and water management practices.
3. What happens if I don’t submit an INMP Summary Report?
Failure to comply with INMP reporting requirements can lead to fines, increased scrutiny from regulatory bodies, and potential harm to water quality.
4. How often do I need to update my INMP?
INMPs must be reviewed and updated annually to reflect current farm management practices.
5. Can I certify my own INMP?
Self-certification is an option if your farm is not in a High Vulnerability Area and you complete the approved INMP Self-Certification program CDFA offers.
6. What should I do if I’m unsure about HVA designation?
Consult your coalition or local Water Boards office to verify whether your farm operates in an HVA.
Take Action Toward Compliance and Sustainability
Understanding and implementing an Irrigation and Nitrogen Management Plan (INMP) is crucial for California farmers, especially in the Central Valley. Adhering to these requirements, you help protect water quality, ensure compliance with state regulations, and promote sustainable agricultural practices.
If you’re still navigating INMP compliance, consider joining a coalition like the East San Joaquin Water Quality Coalition or contacting a Certified Crop Advisor for personalized guidance. Start today and take the first step toward protecting our shared water resources while optimizing your farming operations.
