What is a nutrient management plan setback?

A setback is the minimum distance a manure or fertilizer application must stay from sensitive features like streams, wells, tile inlets, and sinkholes. NRCS Code 590 and state rules set these distances to keep nutrients from running off or leaching into water before the soil can use them.

Why does the application method change the setback?

Surface broadcasting leaves nutrients exposed to runoff, so it needs the largest setbacks. Incorporating into the soil or injecting below the surface sharply reduces runoff risk, so plans allow smaller setbacks for those methods. The tool scales the required distances accordingly.

Why is frozen or saturated ground prohibited?

On frozen, snow-covered, or saturated ground, nutrients cannot infiltrate and instead run off with snowmelt or rain straight into water. Most plans flatly prohibit application under these conditions, which is why the tool blocks it regardless of setback distances.

How does a buffer strip help?

A vegetated buffer strip at the water's edge traps and filters runoff, so plans often allow a reduced surface-water setback when one is present. The tool applies a reduction when you indicate a buffer exists, reflecting that lower runoff risk.

Are these distances exact for my farm?

No. The distances are illustrative Code 590-style defaults. Your actual nutrient management plan, state regulations, slope, and proximity to wells and karst govern, and they can be stricter. Override the required distances with your plan's figures and confirm with your NRCS office or certified planner.

Agricultural Water Quality Compliance Checker

Applying manure or fertilizer too close to water, or at the wrong time, is one of the fastest ways to fall out of compliance with a nutrient management plan and to lose nutrients to runoff. This checker compares your proposed application against representative NRCS Code 590-style setback distances and the frozen-ground rule, flagging anything that is too close or out of bounds.

How it works

Required setbacks start from the most protective case — surface broadcast — and are reduced for lower-runoff methods and a vegetated buffer:

required = base_setback × method_factor × buffer_factor
  method_factor: surface 1.0 · incorporated 0.5 · injected 0.35
  buffer_factor: 0.7 for surface water when a buffer strip is present
compliant = actual_distance ≥ required   (for each feature)
frozen / saturated ground → application prohibited

Each feature — surface water, wells, tile inlets, and sinkholes — is checked independently, and a frozen, snow-covered, or saturated ground condition blocks the application outright.

Example

A surface broadcast 120 ft from a stream may be fine where a buffer strip lowers the required setback to around 70 ft, but the same application 40 ft from a tile inlet that requires 50 ft is too close and would be flagged. Switching to injection lowers the required distances and can bring a marginal field into compliance.

Notes

The distances here are illustrative defaults. Your actual nutrient management plan and state rules govern and may be stricter, especially near wells and karst or on steep slopes. Override the required distances with your plan’s figures, and confirm any application with your NRCS office or certified planner.