diff --git a/packages/pg-connection-string/index.js b/packages/pg-connection-string/index.js
index 65951c374..c07b146a9 100644
--- a/packages/pg-connection-string/index.js
+++ b/packages/pg-connection-string/index.js
@@ -81,6 +81,25 @@ function parse(str) {
     config.ssl.ca = fs.readFileSync(config.sslrootcert).toString()
   }
 
+  switch (config.sslmode) {
+    case 'disable': {
+      config.ssl = false
+      break
+    }
+    case 'prefer':
+    case 'require':
+    case 'verify-ca':
+    case 'verify-full': {
+      config.ssl = config.ssl || true
+      break
+    }
+    case 'no-verify': {
+      config.ssl = config.ssl || {}
+      config.ssl.rejectUnauthorized = false
+      break
+    }
+  }
+
   return config
 }
 
diff --git a/packages/pg-connection-string/test/parse.js b/packages/pg-connection-string/test/parse.js
index 035b025d1..9a88f1d09 100644
--- a/packages/pg-connection-string/test/parse.js
+++ b/packages/pg-connection-string/test/parse.js
@@ -241,6 +241,52 @@ describe('parse', function () {
     })
   })
 
+  it('configuration parameter sslmode=no-verify', function () {
+    var connectionString = 'pg:///?sslmode=no-verify'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql({
+      rejectUnauthorized: false,
+    })
+  })
+
+  it('configuration parameter sslmode=disable', function () {
+    var connectionString = 'pg:///?sslmode=disable'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql(false)
+  })
+
+  it('configuration parameter sslmode=prefer', function () {
+    var connectionString = 'pg:///?sslmode=prefer'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql(true)
+  })
+
+  it('configuration parameter sslmode=require', function () {
+    var connectionString = 'pg:///?sslmode=require'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql(true)
+  })
+
+  it('configuration parameter sslmode=verify-ca', function () {
+    var connectionString = 'pg:///?sslmode=verify-ca'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql(true)
+  })
+
+  it('configuration parameter sslmode=verify-full', function () {
+    var connectionString = 'pg:///?sslmode=verify-full'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql(true)
+  })
+
+  it("configuration parameter sslmode=require doesn't overwrite sslrootcert=/path/to/ca", function () {
+    var connectionString = 'pg:///?sslrootcert=' + __dirname + '/example.ca&sslmode=require'
+    var subject = parse(connectionString)
+    subject.ssl.should.eql({
+      ca: 'example ca\n',
+    })
+  })
+
   it('allow other params like max, ...', function () {
     var subject = parse('pg://myhost/db?max=18&min=4')
     subject.max.should.equal('18')