diff --git a/static-site/.eslintrc.yaml b/static-site/.eslintrc.yaml
index 88cd73d72..fb78f6089 100644
--- a/static-site/.eslintrc.yaml
+++ b/static-site/.eslintrc.yaml
@@ -10,7 +10,7 @@ extends:
   - eslint:recommended
   - plugin:react/recommended
   - plugin:react-hooks/recommended
-  - plugin:@typescript-eslint/recommended
+  - plugin:@typescript-eslint/strict
   # We use the recommended Next.js eslint configuration `next/core-web-vitals` as per
   # <https://nextjs.org/docs/pages/building-your-application/configuring/eslint#core-web-vitals>
   # As of April 2024, the extension simply adds the `@next/next/core-web-vitals` plugin:
@@ -27,6 +27,7 @@ ignorePatterns:
   - public/
 
 rules:
+  "@typescript-eslint/consistent-type-assertions": ["error", { assertionStyle: 'never' }]
   react/prop-types: off # Remove this override once all props have been typed using PropTypes or TypeScript.
   '@next/next/no-img-element': off # Remove this if we use next.js optimisations for <img>
   '@next/next/no-html-link-for-pages': off
diff --git a/static-site/app/blog/[id]/page.tsx b/static-site/app/blog/[id]/page.tsx
index bb8e77262..343c5e408 100644
--- a/static-site/app/blog/[id]/page.tsx
+++ b/static-site/app/blog/[id]/page.tsx
@@ -27,6 +27,18 @@ export function generateStaticParams(): BlogPostParams[] {
   });
 }
 
+type PopulatedMetadata = Metadata & {
+  metadataBase: URL
+  openGraph: {
+    description: string
+    images: { url: string}[]
+    siteName: string
+    title: string
+    type: "website"
+    url: URL | string
+  }
+}
+
 // generate opengraph and other metadata tags
 export async function generateMetadata({
   params,
@@ -37,7 +49,7 @@ export async function generateMetadata({
 
   // set up some defaults that are independent of the specific blog post
   const baseUrl = new URL(siteUrl);
-  const metadata: Metadata = {
+  const metadata: PopulatedMetadata = {
     metadataBase: baseUrl,
     openGraph: {
       description: siteTitleAlt,
@@ -61,9 +73,9 @@ export async function generateMetadata({
 
     metadata.title = blogPost.title;
     metadata.description = description;
-    metadata.openGraph!.description = description;
-    metadata.openGraph!.title = `${siteTitle}: ${blogPost.title}`;
-    metadata.openGraph!.url = `/blog/${blogPost.blogUrlName}`;
+    metadata.openGraph.description = description;
+    metadata.openGraph.title = `${siteTitle}: ${blogPost.title}`;
+    metadata.openGraph.url = `/blog/${blogPost.blogUrlName}`;
   }
 
   return metadata;
diff --git a/static-site/src/components/ListResources/errors.tsx b/static-site/src/components/ErrorBoundary.tsx
similarity index 87%
rename from static-site/src/components/ListResources/errors.tsx
rename to static-site/src/components/ErrorBoundary.tsx
index c4bd9eeff..f1cadbb6e 100644
--- a/static-site/src/components/ListResources/errors.tsx
+++ b/static-site/src/components/ErrorBoundary.tsx
@@ -1,11 +1,7 @@
 import React, { ErrorInfo, ReactNode } from "react";
-import { ErrorContainer } from "../../pages/404";
+import { ErrorContainer } from "../pages/404";
 
-export class InternalError extends Error {
-  constructor(message: string) {
-    super(message);
-  }
-}
+export class InternalError extends Error {}
 
 interface Props {
   children: ReactNode;
diff --git a/static-site/src/components/Groups/Tiles/index.tsx b/static-site/src/components/Groups/Tiles/index.tsx
index 518c50be6..4071b64e8 100644
--- a/static-site/src/components/Groups/Tiles/index.tsx
+++ b/static-site/src/components/Groups/Tiles/index.tsx
@@ -7,9 +7,18 @@ import { UserContext } from "../../../layouts/userDataWrapper";
 import { GroupTile } from "./types";
 import { Group } from "../types";
 import { ExpandableTiles } from "../../ExpandableTiles";
+import { ErrorBoundary, InternalError } from "../../ErrorBoundary";
 
 
 export const GroupTiles = () => {
+  return (
+    <ErrorBoundary>
+      <GroupTilesUnhandled />
+    </ErrorBoundary>
+  );
+};
+
+const GroupTilesUnhandled = () => {
   const { visibleGroups } = useContext(UserContext);
   return (
     <ExpandableTiles
@@ -25,8 +34,13 @@ function createGroupTiles(groups: Group[], colors = [...theme.titleColors]): Gro
   return groups
     .sort((a, b) => a.name.localeCompare(b.name))
     .map((group) => {
-      const groupColor = colors[0]!;
-      colors.push(colors.shift()!);
+      if (colors[0] === undefined) {
+        throw new InternalError("Colors are missing.");
+      }
+      const groupColor = colors[0];
+
+      // Rotate the colors
+      colors.push(colors.shift()!);  // eslint-disable-line @typescript-eslint/no-non-null-assertion
 
       const tile: GroupTile = {
         img: "empty.png",
diff --git a/static-site/src/components/ListResources/IndividualResource.tsx b/static-site/src/components/ListResources/IndividualResource.tsx
index 2e1ad18f6..eaa73fd1d 100644
--- a/static-site/src/components/ListResources/IndividualResource.tsx
+++ b/static-site/src/components/ListResources/IndividualResource.tsx
@@ -5,7 +5,7 @@ import { MdHistory } from "react-icons/md";
 import { SetModalResourceContext } from './Modal';
 import { ResourceDisplayName, Resource, DisplayNamedResource } from './types';
 import { IconType } from 'react-icons';
-import { InternalError } from './errors';
+import { InternalError } from '../ErrorBoundary';
 
 export const LINK_COLOR = '#5097BA'
 export const LINK_HOVER_COLOR = '#31586c'
@@ -139,9 +139,17 @@ export const IndividualResource = ({
       throw new InternalError("ref must be defined and the parent must be a div (IndividualResourceContainer).");
      }
 
+     // The type of ref.current.parentNode is ParentNode which does not have an
+     // offsetTop property. I don't think there is a way to appease the
+     // TypeScript compiler other than a type assertion. It is loosely coupled
+     // to the check above for parentNode.nodeName.
+     // Note: this doesn't strictly have to be a div, but that's what it is in
+     // current usage of the component at the time of writing.
+     const parentNode = ref.current.parentNode as HTMLDivElement  // eslint-disable-line @typescript-eslint/consistent-type-assertions
+
     /* The column CSS is great but doesn't allow us to know if an element is at
     the top of its column, so we resort to JS */
-    if (ref.current.offsetTop===(ref.current.parentNode as HTMLDivElement).offsetTop) {
+    if (ref.current.offsetTop===parentNode.offsetTop) {
       setTopOfColumn(true);
     }
   }, []);
diff --git a/static-site/src/components/ListResources/Modal.tsx b/static-site/src/components/ListResources/Modal.tsx
index e94bca1fb..49db5664c 100644
--- a/static-site/src/components/ListResources/Modal.tsx
+++ b/static-site/src/components/ListResources/Modal.tsx
@@ -5,7 +5,7 @@ import * as d3 from "d3";
 import { MdClose } from "react-icons/md";
 import { dodge } from "./dodge";
 import { Resource, VersionedResource } from './types';
-import { InternalError } from './errors';
+import { InternalError } from '../ErrorBoundary';
 
 export const SetModalResourceContext = createContext<React.Dispatch<React.SetStateAction<Resource | undefined>> | null>(null);
 
diff --git a/static-site/src/components/ListResources/ResourceGroup.tsx b/static-site/src/components/ListResources/ResourceGroup.tsx
index 5a9345aba..01309086d 100644
--- a/static-site/src/components/ListResources/ResourceGroup.tsx
+++ b/static-site/src/components/ListResources/ResourceGroup.tsx
@@ -6,7 +6,7 @@ import { IndividualResource, getMaxResourceWidth, TooltipWrapper, IconContainer,
   ResourceLinkWrapper, ResourceLink, LINK_COLOR, LINK_HOVER_COLOR } from "./IndividualResource"
 import { SetModalResourceContext } from "./Modal";
 import { DisplayNamedResource, Group, QuickLink, Resource } from './types';
-import { InternalError } from './errors';
+import { InternalError } from '../ErrorBoundary';
 
 const ResourceGroupHeader = ({
   group,
diff --git a/static-site/src/components/ListResources/index.tsx b/static-site/src/components/ListResources/index.tsx
index 853d2e7f7..d69ba71ff 100644
--- a/static-site/src/components/ListResources/index.tsx
+++ b/static-site/src/components/ListResources/index.tsx
@@ -14,7 +14,7 @@ import {ResourceModal, SetModalResourceContext} from "./Modal";
 import { ExpandableTiles } from "../ExpandableTiles";
 import { FilterTile, FilterOption, Group, QuickLink, Resource, ResourceListingInfo, SortMethod, convertVersionedResource } from './types';
 import { HugeSpacer } from "../../layouts/generalComponents";
-import { ErrorBoundary } from './errors';
+import { ErrorBoundary, InternalError } from '../ErrorBoundary';
 
 const LIST_ANCHOR = "list";
 
@@ -182,7 +182,12 @@ function SortOptions({sortMethod, changeSortMethod}: {
   changeSortMethod: React.Dispatch<React.SetStateAction<SortMethod>>,
 }) {
   function onChangeValue(event: FormEvent<HTMLInputElement>): void {
-    changeSortMethod(event.currentTarget.value as SortMethod);
+    const sortMethod = event.currentTarget.value;
+    if (sortMethod !== "alphabetical" &&
+        sortMethod !== "lastUpdated") {
+      throw new InternalError(`Unhandled sort method: '${sortMethod}'`);
+    }
+    changeSortMethod(sortMethod);
   }
   return (
     <SortContainer>
diff --git a/static-site/src/components/ListResources/types.ts b/static-site/src/components/ListResources/types.ts
index 57c8e5c64..02390fe97 100644
--- a/static-site/src/components/ListResources/types.ts
+++ b/static-site/src/components/ListResources/types.ts
@@ -1,4 +1,4 @@
-import { InternalError } from "./errors";
+import { InternalError } from "../ErrorBoundary";
 import { Tile } from "../ExpandableTiles/types"
 
 export interface FilterOption {
diff --git a/static-site/src/components/ListResources/useDataFetch.ts b/static-site/src/components/ListResources/useDataFetch.ts
index 939aaf45f..c18db4399 100644
--- a/static-site/src/components/ListResources/useDataFetch.ts
+++ b/static-site/src/components/ListResources/useDataFetch.ts
@@ -1,5 +1,6 @@
 import { useState, useEffect } from 'react';
 import { Group, Resource, ResourceListingInfo } from './types';
+import { InternalError } from '../ErrorBoundary';
 
 
 /**
@@ -65,8 +66,16 @@ function partitionByPathogen(
     const sortedDates = [...dates].sort();
 
     const nameParts = name.split('/');
-    // split() will always return at least 1 string
-    const groupName = nameParts[0]!;
+
+    if (nameParts[0] === undefined) {
+      throw new InternalError(`Name is not properly formatted: '${name}'`);
+    }
+
+    if (sortedDates[0] === undefined) {
+      throw new InternalError("Resource does not have any dates.");
+    }
+
+    const groupName = nameParts[0];
 
     const resourceDetails: Resource = {
       name,
@@ -77,14 +86,13 @@ function partitionByPathogen(
       lastUpdated: sortedDates.at(-1),
     };
     if (versioned) {
-      resourceDetails.firstUpdated = sortedDates[0]!;
+      resourceDetails.firstUpdated = sortedDates[0];
       resourceDetails.dates = sortedDates;
       resourceDetails.nVersions = sortedDates.length;
       resourceDetails.updateCadence = updateCadence(sortedDates.map((date)=> new Date(date)));
     }
 
-    if (!store[groupName]) store[groupName] = [];
-    store[groupName]!.push(resourceDetails)
+    (store[groupName] ??= []).push(resourceDetails)
 
     return store;
   }, {});
diff --git a/static-site/src/components/splash/index.tsx b/static-site/src/components/splash/index.tsx
index bc6ee8b05..ac1bdf92d 100644
--- a/static-site/src/components/splash/index.tsx
+++ b/static-site/src/components/splash/index.tsx
@@ -116,6 +116,7 @@ const Splash = () => {
       </Styles.H1Small>
 
       <BigSpacer/>
+      {/* eslint-disable-next-line @typescript-eslint/consistent-type-assertions */}
       <ExpandableTiles tiles={featuredAnalyses as unknown as SplashTile[]} tileWidth={tileWidth} tileHeight={tileHeight} TileComponent={Tile} />
       <Tooltip style={{fontSize: '1.6rem'}} id={tooltipId} />
 
diff --git a/static-site/src/sections/group-members-page.tsx b/static-site/src/sections/group-members-page.tsx
index 00776938c..3b8f6d48a 100644
--- a/static-site/src/sections/group-members-page.tsx
+++ b/static-site/src/sections/group-members-page.tsx
@@ -40,7 +40,7 @@ const GroupMembersPage = ({ groupName }: {groupName: string}) => {
         roles = await rolesResponse.json();
         members = await membersResponse.json();
       } catch (err) {
-        const errorMessage = (err as Error).message
+        const errorMessage = err instanceof Error ? err.message : String(err)
         if(!ignore) {
           setErrorMessage({
             title: "An error occurred when trying to fetch group membership data",
@@ -77,7 +77,7 @@ const GroupMembersPage = ({ groupName }: {groupName: string}) => {
       <BigSpacer/>
 
       {roles && members
-        ? <MembersTable members={members as GroupMember[]} />
+        ? <MembersTable members={members} />
         : <splashStyles.H4>Fetching group members...</splashStyles.H4>}
     </GenericPage>
   )
@@ -150,7 +150,7 @@ export async function canViewGroupMembers(groupName: string) {
       const allowedMethods = new Set(groupMemberOptions.headers.get("Allow")?.split(/\s*,\s*/));
       return allowedMethods.has("GET");
   } catch (err) {
-    const errorMessage = (err as Error).message
+    const errorMessage = err instanceof Error ? err.message : String(err)
     console.error("Cannot check user permissions to view group members", errorMessage);
   }
   return false