| Document and Entity Information | Jul. 05, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 05, 2023 |
| Entity File Number | 001-38523 |
| Entity Registrant Name | CHARAH SOLUTIONS, INC. |
| Entity Central Index Key | 0001730346 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 82-4228671 |
| Entity Address, Address Line One | 12601 Plantside Drive |
| Entity Address, City or Town | Louisville |
| Entity Address, State or Province | KY |
| Entity Address, Postal Zip Code | 40299 |
| City Area Code | 502 |
| Local Phone Number | 245-1353 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
