Snippet to remove UTM parameters from using the History API.

strip-utm-params-min.js

!function(){var e=history,t=location;if(e&&e.replaceState&&t.search){var n=t.search.slice(1).split("&"),l=n.filter(function(e){return"utm_"!==e.slice(0,4)});if(l.length<n.length){var a=l.length?"?"+l.join("&"):"",i=t.pathname+a+t.hash;setTimeout(function(){e.replaceState(null,null,i)},3e3)}}}();

strip-utm-params.js

(function() {
  var hsty = history;
  var loc = location;

  function paramIsNotUtm(param) {
    return param.slice(0, 4) !== 'utm_';
  }
  
  if (hsty && hsty.replaceState && loc.search) {
    var params = loc.search.slice(1).split('&');
    var newParams = params.filter(paramIsNotUtm);

    if (newParams.length < params.length) {
      var search = newParams.length ? '?' + newParams.join('&') : '';
      var url = loc.pathname + search + loc.hash;

      setTimeout(function() {
        hsty.replaceState(null, null, url);
      }, 3000);
    }
  }
}());