In the history of the Internet, encrypting what you send and receive on typical business websites was deemed necessary only when sending credit card information, to prevent leaking that information to someone who was, essentially, "tapping" your Internet line.
Google is changing that, though. They have announced that "Starting October 2017, Chrome (version 62) will show a "NOT SECURE" warning when users enter text in a form" on an unencrypted page -- meaning that even just asking for name and phone number on your contact page will trigger that warning."
Firefox and the other browsers seem to be following suit.
They are warning the public that if someone is tapping their Internet line, that scoundrel can learn their name and phone number when they fill out your contact page.
Soon, and more significantly, they will show "not secure" on ALL web pages that are not being encrypted, even if you do not ask your visitors to submit anything. (Read Google's announcement here.)
It's your choice.
Many would say that a security "threat" such as this is negligible, but "perception is reality", so while some business owners might just ignore the warning and trust that their visitors will do so also, you might want to consider adding encryption to your site, so as not to deter any visitors due to Google's dire warning message.
Talk to your web team about enabling encryption on your website.