diff --git a/lib/constructed-queries.js b/lib/constructed-queries.js
index 317dddf..2bff6a3 100644
--- a/lib/constructed-queries.js
+++ b/lib/constructed-queries.js
@@ -36,6 +36,10 @@ module.exports = {
     `
     return Query.fromString(sql)
   },
+  updateTelemetryHistory: () => {
+    const sql = 'SELECT u_flood.update_telemetry_history();'
+    return Query.fromString(sql)
+  },
   refreshStationMviews: () => {
     const sql = `
         REFRESH MATERIALIZED VIEW CONCURRENTLY u_flood.telemetry_context_mview WITH DATA; 
diff --git a/lib/functions/telemetry-history.js b/lib/functions/telemetry-history.js
new file mode 100644
index 0000000..1220449
--- /dev/null
+++ b/lib/functions/telemetry-history.js
@@ -0,0 +1,10 @@
+const { Pool } = require('../helpers/pool')
+
+module.exports.handler = async () => {
+  const pool = new Pool({ connectionString: process.env.LFW_DATA_DB_CONNECTION })
+  try {
+    await pool.query('updateTelemetryHistory')
+  } finally {
+    await pool.end()
+  }
+}
diff --git a/readme.md b/readme.md
index 0bc174a..7be9a3f 100644
--- a/readme.md
+++ b/readme.md
@@ -32,6 +32,10 @@ brings in the observed telemtery data from the S3 bucket and processes it into t
 
 refreshes the materialized views and clears out the old telemetry.
 
+### telemetry-history
+
+Runs `u_flood.update_telemetry_history()` to maintain historical telemetry. Its schedule is configured separately in Terraform and should run at every day but at a minimum must run at least once every 5 days. This function will also clear any historical data over 3 years old.
+
 ### station-process
 
 Uses the exports context file from sharepoint to update the stations in the database.
@@ -91,6 +95,7 @@ Cron configurations (e.g., thresholds, data syncs) are managed per environment v
 export LFW_DATA_IMTD_THRESHOLD_SCHEDULE=
 export LFW_DATA_DTS_SCHEDULE=
 export LFW_DATA_FWIS_SCHEDULE=
+export LFW_DATA_TELEMETRY_HISTORY_SCHEDULE=
 ```
 
 These are defined in the Terraform modules and should be updated through the infrastructure as code process.
diff --git a/test/unit/constructed-queries.js b/test/unit/constructed-queries.js
index 67d4589..8fee1c9 100644
--- a/test/unit/constructed-queries.js
+++ b/test/unit/constructed-queries.js
@@ -1,7 +1,7 @@
 const { expect } = require('@hapi/code')
 const Lab = require('@hapi/lab')
 const {
-  slsTelemetryValues, slsTelemetryStation, slsTelemetryValueParent, deleteOldTelemetry, refreshStationMviews,
+  slsTelemetryValues, slsTelemetryStation, slsTelemetryValueParent, deleteOldTelemetry, updateTelemetryHistory, refreshStationMviews,
   deleteStations, insertStations, upsertFfoiMax, deleteCurrentFwis, insertFloodWarnings, refreshFloodWarningsMview,
   updateTimestamp
 } = require('../../lib/constructed-queries')
@@ -101,6 +101,17 @@ describe('constructedQueries', () => {
     })
   })
 
+  describe('updateTelemetryHistory', () => {
+    it('returns the history update sql in a query object', () => {
+      // Act
+      const actual = updateTelemetryHistory()
+
+      // Assert
+      expect(actual.text).to.equal('SELECT u_flood.update_telemetry_history();')
+      expect(actual.values).to.be.undefined()
+    })
+  })
+
   describe('refreshStationMviews', () => {
     it('returns appropriate sql in a query object', () => {
       // Act
diff --git a/test/unit/functions/telemetry-history.js b/test/unit/functions/telemetry-history.js
new file mode 100644
index 0000000..ae06794
--- /dev/null
+++ b/test/unit/functions/telemetry-history.js
@@ -0,0 +1,38 @@
+const Lab = require('@hapi/lab')
+const lab = exports.lab = Lab.script()
+const Code = require('@hapi/code')
+const sinon = require('sinon')
+const proxyquire = require('proxyquire')
+
+lab.experiment('telemetry history', () => {
+  lab.test('runs the history update query before ending the pool', async () => {
+    const pool = {
+      query: sinon.stub().resolves(),
+      end: sinon.stub().resolves()
+    }
+    const Pool = sinon.stub().returns(pool)
+    const { handler } = proxyquire('../../../lib/functions/telemetry-history', {
+      '../helpers/pool': { Pool }
+    })
+
+    await handler()
+
+    sinon.assert.calledOnceWithExactly(pool.query, 'updateTelemetryHistory')
+    sinon.assert.callOrder(pool.query, pool.end)
+  })
+
+  lab.test('ends the pool and propagates a history update failure', async () => {
+    const error = new Error('history update failed')
+    const pool = {
+      query: sinon.stub().rejects(error),
+      end: sinon.stub().resolves()
+    }
+    const Pool = sinon.stub().returns(pool)
+    const { handler } = proxyquire('../../../lib/functions/telemetry-history', {
+      '../helpers/pool': { Pool }
+    })
+
+    await Code.expect(handler()).to.reject()
+    sinon.assert.calledOnce(pool.end)
+  })
+})