diff --git a/routes/adjustmentMethods/AdjustmentMethod.ts b/routes/adjustmentMethods/AdjustmentMethod.ts
index f80a3b1..006b7d6 100644
--- a/routes/adjustmentMethods/AdjustmentMethod.ts
+++ b/routes/adjustmentMethods/AdjustmentMethod.ts
@@ -1,6 +1,5 @@
 import { BaseWateringData, GeoCoordinates, PWS } from "../../types";
 import { WeatherProvider } from "../weatherProviders/WeatherProvider";
-import { ErrorCode } from "../../errors";
 
 
 export interface AdjustmentMethod {
@@ -44,8 +43,6 @@ export interface AdjustmentMethodResponse {
 	 * watering.
 	 */
 	rainDelay?: number;
-	/** A code describing the type of error that occurred (if one occurred). */
-	errCode?: ErrorCode;
 	/** The data that was used to calculate the watering scale, or undefined if no data was used. */
 	wateringData: BaseWateringData;
 }
diff --git a/routes/adjustmentMethods/ZimmermanAdjustmentMethod.ts b/routes/adjustmentMethods/ZimmermanAdjustmentMethod.ts
index bbbc7e3..59375e1 100644
--- a/routes/adjustmentMethods/ZimmermanAdjustmentMethod.ts
+++ b/routes/adjustmentMethods/ZimmermanAdjustmentMethod.ts
@@ -2,7 +2,7 @@ import { AdjustmentMethod, AdjustmentMethodResponse, AdjustmentOptions } from ".
 import { GeoCoordinates, PWS, ZimmermanWateringData } from "../../types";
 import { validateValues } from "../weather";
 import { WeatherProvider } from "../weatherProviders/WeatherProvider";
-import { ErrorCode } from "../../errors";
+import { CodedError, ErrorCode } from "../../errors";
 
 
 /**
@@ -39,12 +39,7 @@ async function calculateZimmermanWateringScale(
 	// Check to make sure valid data exists for all factors
 	if ( !validateValues( [ "temp", "humidity", "precip" ], wateringData ) ) {
 		// Default to a scale of 100% if fields are missing.
-		return {
-			scale: 100,
-			rawData: rawData,
-			errCode: ErrorCode.MissingWeatherField,
-			wateringData: wateringData
-		};
+		throw new CodedError( ErrorCode.MissingWeatherField );
 	}
 
 	let humidityBase = 30, tempBase = 70, precipBase = 0;
diff --git a/routes/weather.ts b/routes/weather.ts
index 047f88d..c8d3e76 100644
--- a/routes/weather.ts
+++ b/routes/weather.ts
@@ -196,7 +196,7 @@ export const getWateringData = async function( req: express.Request, res: expres
 	remoteAddress = remoteAddress.split( "," )[ 0 ];
 
 	if ( !adjustmentMethod ) {
-		sendWateringData( res, { errCode: ErrorCode.InvalidAdjustmentMethod } );
+		sendWateringError( res, new CodedError( ErrorCode.InvalidAdjustmentMethod ));
 		return;
 	}
 
@@ -210,7 +210,7 @@ export const getWateringData = async function( req: express.Request, res: expres
 		adjustmentOptions = JSON.parse( "{" + adjustmentOptionsString + "}" );
 	} catch ( err ) {
 		// If the JSON is not valid then abort the calculation
-		sendWateringData( res, { errCode: ErrorCode.MalformedAdjustmentOptions } );
+		sendWateringError( res, new CodedError( ErrorCode.MalformedAdjustmentOptions ) );
 		return;
 	}
 
@@ -224,7 +224,7 @@ export const getWateringData = async function( req: express.Request, res: expres
 			console.error( `An unexpected error occurred during location resolution for "${ req.url }": `, err );
 		}
 
-		sendWateringData( res, { errCode: codedError.errCode } );
+		sendWateringError( res, codedError );
 		return;
 	}
 
@@ -241,11 +241,11 @@ export const getWateringData = async function( req: express.Request, res: expres
 
 		// Make sure that the PWS ID and API key look valid.
 		if ( !pwsId ) {
-			sendWateringData( res, { errCode: ErrorCode.InvalidPwsId } );
+			sendWateringError( res, new CodedError( ErrorCode.InvalidPwsId ) );
 			return;
 		}
 		if ( !apiKey ) {
-			sendWateringData( res, { errCode: ErrorCode.InvalidPwsApiKey } );
+			sendWateringError( res, new CodedError( ErrorCode.InvalidPwsApiKey ) );
 			return;
 		}
 
@@ -288,12 +288,11 @@ export const getWateringData = async function( req: express.Request, res: expres
 				console.error( `An unexpected error occurred during watering scale calculation for "${ req.url }": `, err );
 			}
 
-			sendWateringData( res, { errCode: codedError.errCode } );
+			sendWateringError( res, codedError );
 			return;
 		}
 
 		data.scale = adjustmentMethodResponse.scale;
-		data.errCode = adjustmentMethodResponse.errCode || 0;
 		data.rd = adjustmentMethodResponse.rainDelay;
 		data.rawData = adjustmentMethodResponse.rawData;
 
@@ -309,7 +308,7 @@ export const getWateringData = async function( req: express.Request, res: expres
 						console.error( `An unexpected error occurred during restriction checks for "${ req.url }": `, err );
 					}
 
-					sendWateringData( res, { errCode: codedError.errCode } );
+					sendWateringError( res, codedError );
 					return;
 				}
 			}
@@ -333,6 +332,16 @@ export const getWateringData = async function( req: express.Request, res: expres
 	sendWateringData( res, data, outputFormat === "json" );
 };
 
+/**
+ * Sends a response to a watering scale request with an error code and a default watering scale of 100%.
+ * @param res The Express Response object to send the response through.
+ * @param error The error code to send in the response body.
+ * @param useJson Indicates if the response body should use a JSON format instead of a format similar to URL query strings.
+ */
+function sendWateringError( res: express.Response, error: CodedError, useJson: boolean = false ) {
+	sendWateringData( res, { errCode: error.errCode, scale: 100 } );
+}
+
 /**
  * Sends a response to an HTTP request with a 200 status code.
  * @param res The Express Response object to send the response through.