| Cover | Nov. 08, 2021 | Aug. 05, 2021 | Nov. 05, 2020 |
| Document Information [Line Items] | |||
| Document Type | 8-K | ||
| Document Period End Date | Nov. 8, 2021 | ||
| 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, State or Province | AZ | ||
| Entity Address, City or Town | Phoenix, | ||
| 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 | true | ||
| Entity Ex Transition Period | false | ||
| Amendment Flag | false | ||
| Entity Central Index Key | 0001434728 |
