diff --git a/web/cypress/e2e/incidents/regression/01.reg_filtering.cy.ts b/web/cypress/e2e/incidents/regression/01.reg_filtering.cy.ts
new file mode 100644
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+++ b/web/cypress/e2e/incidents/regression/01.reg_filtering.cy.ts
@@ -0,0 +1,151 @@
+/*
+Regression test for incidents filtering functionality.
+
+This test uses the comprehensive filtering test scenarios to verify
+that filtering works correctly across various incident types and severities.
+Uses elements defined in incidents-page.ts for all interactions.
+
+Verifies: OU-727
+*/
+
+import { incidentsPage } from '../../../views/incidents-page';
+
+const MCP = {
+  namespace: 'openshift-cluster-observability-operator',
+  packageName: 'cluster-observability-operator',
+  operatorName: 'Cluster Observability Operator',
+  config: {
+    kind: 'UIPlugin',
+    name: 'monitoring',
+  },
+};
+
+const MP = {
+  namespace: 'openshift-monitoring',
+  operatorName: 'Cluster Monitoring Operator',
+};
+
+describe('Regression: Incidents Filtering', () => {
+
+  before(() => {
+    cy.beforeBlockCOO(MCP, MP);
+  });
+
+  beforeEach(() => {
+    cy.log('Navigate to Observe → Incidents');
+    incidentsPage.goTo();
+    cy.log('Setting up comprehensive filtering test scenarios');
+    cy.mockIncidentFixture('incident-scenarios/7-comprehensive-filtering-test-scenarios.yaml');
+  });
+
+  it('1. Severity filtering - Critical, Warning, Info', () => {
+    cy.log('1.1 Clear all filters and ensure all incidents are loaded');
+    incidentsPage.clearAllFilters();
+
+    incidentsPage.setDays('1 day');
+    incidentsPage.setDays('7 days');
+    
+    incidentsPage.elements.incidentsChartContainer().should('be.visible');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 12);
+    cy.log('All 12 incidents from comprehensive filtering scenarios are loaded');
+    
+    
+    cy.log('1.2 Active filters: Critical');
+    incidentsPage.toggleFilter('Critical');
+    
+    incidentsPage.elements.severityFilterChip().should('be.visible');
+    incidentsPage.elements.incidentsChartContainer().should('be.visible');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 7);
+    
+    cy.log('Verified: 7 incidents shown');
+    
+    
+    cy.log('1.3 Active filters: Warning');
+    incidentsPage.toggleFilter('Critical');  // Deselect Critical
+    incidentsPage.toggleFilter('Warning');   // Select Warning
+    incidentsPage.elements.severityFilterChip().should('be.visible');
+    incidentsPage.elements.incidentsChartContainer().should('be.visible');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 5);
+    
+    cy.log('Verified: 5 incidents shown');
+    
+    
+    cy.log('1.4 Active filters: Informative');
+    incidentsPage.toggleFilter('Warning');     // Deselect Warning
+    incidentsPage.toggleFilter('Informative'); // Select Info
+    incidentsPage.elements.severityFilterChip().should('be.visible');
+    incidentsPage.elements.incidentsChartContainer().should('be.visible');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 3);
+    
+    cy.log('Verified: 3 incidents shown');
+    
+    
+    cy.log('1.6 Test severity filter combinations');
+    cy.log('1.6.1 Active filters: Critical + Informative');
+    incidentsPage.toggleFilter('Critical');  // Add Critical to existing Info
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 9);
+    cy.log('Verified: 9 incidents shown');
+    
+    
+    cy.log('1.6.2 Active filters: Warning + Informative');
+    incidentsPage.toggleFilter('Critical');  // Deselect Critical
+    incidentsPage.toggleFilter('Warning');   // Add Warning to existing Info
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 7);
+    cy.log('Verified: 7 incidents shown');
+    
+
+    cy.log('1.6.3 Active filters: Critical + Warning + Informative');
+    incidentsPage.toggleFilter('Critical');  // Add Critical to existing Info + Warning
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 12);
+    cy.log('Verified: 12 incidents shown');
+    
+    
+    cy.log('1.7 Test state filter combinations - remove all severity filters and focus on Info + state');
+    cy.log('1.7.1 Active filters: Informative + Resolved');
+    incidentsPage.toggleFilter('Critical');  // Deselect Critical
+    incidentsPage.toggleFilter('Warning');   // Deselect Warning
+    // Now we have only Informative selected
+    incidentsPage.toggleFilter('Resolved');  // Add Resolved state filter
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 1);
+    cy.log('Verified: 1 incident shown');
+    
+    
+    cy.log('1.7.2 Active filters: Informative + Firing');
+    incidentsPage.toggleFilter('Resolved'); // Deselect Resolved
+    incidentsPage.toggleFilter('Firing');   // Select Firing
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 2);
+    cy.log('Verified: 2 incidents shown');
+    
+    
+    incidentsPage.clearAllFilters();
+  });
+
+  it('2. Chart interaction with active filters', () => {
+    cy.log('Setting up filters for chart interaction testing');
+    incidentsPage.clearAllFilters();
+    
+    // Set up a specific filter state for testing
+    incidentsPage.toggleFilter('Informative');
+    incidentsPage.toggleFilter('Firing');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 2);
+    cy.log('Setup complete: Informative + Firing filters active, 2 incidents shown');
+    
+    cy.log('2.1 Select incident bar while filters are active');
+    incidentsPage.selectIncidentByBarIndex(0);
+    incidentsPage.elements.incidentsTable().should('be.visible');
+    cy.log('Incident table displayed after bar selection');
+    
+    cy.log('2.2 Verify just selected incident is shown in the chart');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 1);
+    cy.log('Verified: 1 incident shown');
+    
+    cy.log('2.3 Deselect incident bar and verify filter persistence');
+    incidentsPage.deselectIncidentByBar();
+    incidentsPage.elements.incidentsTable().should('not.exist');
+    incidentsPage.elements.incidentsChartBarsGroups().should('have.length', 2);
+    cy.log('Filters persisted after deselection: 2 incidents still shown');
+    
+    incidentsPage.clearAllFilters();
+  });
+
+});