diff --git a/esphome/components/scd30/sensor.py b/esphome/components/scd30/sensor.py
index a5eb5d8ca4..aad2a1811c 100644
--- a/esphome/components/scd30/sensor.py
+++ b/esphome/components/scd30/sensor.py
@@ -1,4 +1,3 @@
-import re
 import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.components import i2c, sensor
@@ -28,10 +27,6 @@ CONF_AMBIENT_PRESSURE_COMPENSATION = "ambient_pressure_compensation"
 CONF_TEMPERATURE_OFFSET = "temperature_offset"
 
 
-def remove_altitude_suffix(value):
-    return re.sub(r"\s*(?:m(?:\s+a\.s\.l)?)|(?:MAM?SL)$", "", value)
-
-
 CONFIG_SCHEMA = (
     cv.Schema(
         {
@@ -47,7 +42,7 @@ CONFIG_SCHEMA = (
             ),
             cv.Optional(CONF_AUTOMATIC_SELF_CALIBRATION, default=True): cv.boolean,
             cv.Optional(CONF_ALTITUDE_COMPENSATION): cv.All(
-                remove_altitude_suffix,
+                cv.float_with_unit("altitude", "(m|m a.s.l.|MAMSL|MASL)"),
                 cv.int_range(min=0, max=0xFFFF, max_included=False),
             ),
             cv.Optional(CONF_AMBIENT_PRESSURE_COMPENSATION, default=0): cv.pressure,