A nearby canal or water body should not automatically be labeled salt water. Its classification may require reliable local information. Product decisions should not be based on an unsupported assumption drawn from a map image.
What to do next
Identify what is known about the water body and what remains uncertain. Ask the selected manufacturer how its exposure terms apply to the address. Keep uncertain salinity as an unresolved review item rather than converting it into a confident suitability claim.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.