| Cover | Nov. 17, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 17, 2021 |
| Entity Registrant Name | HIGHWATER ETHANOL, LLC |
| Entity File Number | 333-137482 |
| Entity Tax Identification Number | 20-4798531 |
| Entity Incorporation, State or Country Code | MN |
| Entity Address, Address Line One | 24500 US HWY 14 |
| Entity Address, Address Line Two | PO Box 96 |
| Entity Address, City or Town | Lamberton |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 56152 |
| City Area Code | 507 |
| Local Phone Number | 752-6160 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001371451 |
| Amendment Flag | false |
