From comments it looks like this is being used in communications with clients. Without knowing more about those clients and how they might interpret terminology it's difficult to come up with an ideal term, but here are a few possible scenarios.
If you are talking about features or attributes of something which are important enough that they should be paid attention to in a particular environment or context, relevant can be used.
Relevant in this context means a thing is of enough significance that it should not be disregarded, but it does not convey extreme importance. If something is relevant, it needs to be taken into account, but may not be the most important aspect.
Example: "Pages two and three of the instructions are relevant to
customers in Hawaii only."
Noticeable is similar in that it indicates a difference worthy of paying attention to, but not in a dramatic or extreme manner, and is often used to describe a change in a measurement or quantity.
Example: "There was a noticeable improvement in gas mileage after I
replaced my tires."
This indicates the improvement was enough to be worth considering, but it does not convey an extreme or surprising amount of improvement.
If you want to convey that the significance is just enough to achieve a specific threshold and no more, then sufficient will work.
Example: "My exam score was sufficient to ensure I got a B in the
class." The implication is that the score was just high enough, not
exceptional or perfect.