diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfd44c8e45616f2d9be4eb4f7c4dbc0b7f3a65a4..80f61a1acd00dec2dad32d04f6c47cbd73425983 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Data tables accordion shows a table for a secondary instantaneous value parameter data when a second parameter (that has data) is selected.
 - Retrieve data controls now show a radio button for secondary parameter data when appropriate.
 - Title, legend and time series data line will now show for a secondary parameter, if selected.
+- Main hydrograph tool tips now reflect the data points for secondary parameter lines.
 
 ### Changed
 - Data download component was converted to Vue.
diff --git a/assets/src/scripts/d3-rendering/axes.test.js b/assets/src/scripts/d3-rendering/axes.test.js
index 0c91595140268fbd282673306acc8d50f4427126..5ad618595575e2946ed6115df3e8e332e605e476 100644
--- a/assets/src/scripts/d3-rendering/axes.test.js
+++ b/assets/src/scripts/d3-rendering/axes.test.js
@@ -96,7 +96,24 @@ describe('axes module', () => {
             expect(svg.select('.secondary-y-axis .y-axis-label').html()).toBe('ft/3');
         });
 
-        it('should render only one y axis if a secondaryYAxis is not defined', () => {
+        it('expects that secondary axis is removed if a secondary parameter is no longer defined', () => {
+            secondaryYAxis = jest.fn();
+            appendAxes(svg, {xAxis, primaryYAxis, secondaryYAxis, layout, primaryYTitle: 'ft', secondaryYTitle: 'ft/3', secondaryParameter});
+
+            expect(svg.selectAll('.x-axis').size()).toBe(1);
+            expect(svg.selectAll('.y-axis').size()).toBe(1);
+            expect(svg.selectAll('.secondary-y-axis').size()).toBe(1);
+            expect(svg.selectAll('.y-axis-label').size()).toBe(2);
+            expect(svg.select('.y-axis .y-axis-label').html()).toBe('ft');
+            expect(svg.select('.secondary-y-axis .y-axis-label').html()).toBe('ft/3');
+
+            appendAxes(svg, {xAxis, primaryYAxis, layout, primaryYTitle: 'ft'});
+            expect(svg.selectAll('.x-axis').size()).toBe(1);
+            expect(svg.selectAll('.y-axis').size()).toBe(1);
+            expect(svg.selectAll('.secondary-y-axis').size()).toBe(0);
+        });
+
+        it('should render only one y-axis if a secondaryYAxis is not defined', () => {
             appendAxes(svg, {xAxis, primaryYAxis, secondaryYAxis, layout, primaryYTitle: 'ft', secondaryYTitle: '', secondaryParameter: null});
 
             expect(svg.selectAll('.x-axis').size()).toBe(1);
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/tooltip.test.js b/assets/src/scripts/monitoring-location/components/hydrograph/tooltip.test.js
index 49132aab87da290f0ad74d545dced319fd3303ee..5d6d75deff9d715bcc512418f91fe274d5364839 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/tooltip.test.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/tooltip.test.js
@@ -5,7 +5,7 @@ import * as utils from 'ui/utils';
 
 import {configureStore} from 'ml/store';
 
-import {TEST_GW_LEVELS, TEST_PRIMARY_IV_DATA, TEST_CURRENT_TIME_RANGE} from './mock-hydrograph-state';
+import {TEST_GW_LEVELS, TEST_PRIMARY_IV_DATA, TEST_SECONDARY_IV_DATA, TEST_CURRENT_TIME_RANGE} from './mock-hydrograph-state';
 import {drawTooltipText, drawTooltipFocus, drawTooltipCursorSlider, initializeTooltipCursorSlider} from './tooltip';
 
 describe('monitoring-location/components/hydrograph/tooltip module', () => {
@@ -59,8 +59,42 @@ describe('monitoring-location/components/hydrograph/tooltip module', () => {
             value = div.select('.gw-level-point').text().split(' - ')[0];
             expect(value).toBe('27.2 ft');
         });
+
+        it('expects that if a secondary parameter is graphed that it will have a tool tip', () => {
+            const TEST_STATE_SECONDARY_PARAMETER = {
+                hydrographData: {
+                    primaryIVData: TEST_PRIMARY_IV_DATA,
+                    secondaryIVData: TEST_SECONDARY_IV_DATA,
+                    currentTimeRange: TEST_CURRENT_TIME_RANGE
+                },
+                groundwaterLevelData: {
+                    all: [TEST_GW_LEVELS]
+                },
+                hydrographState: {
+                    selectedIVMethodID: '90649',
+                    graphCursorOffset: 500000,
+                    selectedParameterCode: '72019',
+                    selectedSecondaryParameterCode: '00065'
+                },
+                ui: {
+                    windowWidth: 1300,
+                    width: 990
+                }
+            };
+
+            store = configureStore(TEST_STATE_SECONDARY_PARAMETER);
+
+            div.call(drawTooltipText, store);
+            expect(div.select('.primary-tooltip-text').size()).toBe(1);
+            expect(div.select('.primary-tooltip-text').text()).toBe('24.1 ft - Feb 24, 2020 10:30:00 AM CST');
+
+            expect(div.select('.secondary-tooltip-text').size()).toBe(1);
+            expect(div.select('.secondary-tooltip-text').text()).toBe('3.2 ft - Feb 24, 2020 10:30:00 AM CST');
+        });
     });
+
     describe('createTooltipFocus', () => {
+        let store;
         let svg;
         beforeEach(() => {
             svg = select('body').append('svg');
@@ -71,7 +105,7 @@ describe('monitoring-location/components/hydrograph/tooltip module', () => {
         });
 
         it('Creates focus lines and focus circles when cursor not set', () => {
-            let store = configureStore(TEST_STATE);
+            store = configureStore(TEST_STATE);
 
             svg.call(drawTooltipFocus, store);
 
@@ -79,6 +113,38 @@ describe('monitoring-location/components/hydrograph/tooltip module', () => {
             expect(svg.selectAll('.focus-circle').size()).toBe(2);
             expect(svg.select('.focus-overlay').size()).toBe(1);
         });
+
+
+        it('expects that if a secondary parameter is graphed that it will have a focus dot', () => {
+            const TEST_STATE_SECONDARY_PARAMETER = {
+                hydrographData: {
+                    primaryIVData: TEST_PRIMARY_IV_DATA,
+                    secondaryIVData: TEST_SECONDARY_IV_DATA,
+                    currentTimeRange: TEST_CURRENT_TIME_RANGE
+                },
+                groundwaterLevelData: {
+                    all: [TEST_GW_LEVELS]
+                },
+                hydrographState: {
+                    selectedIVMethodID: '90649',
+                    graphCursorOffset: 500000,
+                    selectedParameterCode: '72019',
+                    selectedSecondaryParameterCode: '00065'
+                },
+                ui: {
+                    windowWidth: 1300,
+                    width: 990
+                }
+            };
+
+            store = configureStore(TEST_STATE_SECONDARY_PARAMETER);
+
+            svg.call(drawTooltipFocus, store);
+
+            expect(svg.selectAll('.focus-line').size()).toBe(1);
+            expect(svg.selectAll('.focus-circle').size()).toBe(3);
+            expect(svg.select('.focus-overlay').size()).toBe(1);
+        });
     });
 
     describe('initializeTooltipCursorSlider and drawTooltipCursorSlider', () => {