| Cover | Jul. 14, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 14, 2022 |
| Entity Registrant Name | GLOBAL WATER RESOURCES, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37756 |
| Entity Tax Identification Number | 90-0632193 |
| Entity Address, Address Line One | 21410 N. 19th Avenue #220 |
| Entity Address, Postal Zip Code | 85027 |
| Entity Address, City or Town | Phoenix, |
| Entity Address, State or Province | AZ |
| City Area Code | 480 |
| Local Phone Number | 360-7775 |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | GWRS |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001434728 |
