How many water violations are in Grayson County?

Grayson County has 4,304 total drinking water violations across 50 water systems, of which 1,322 are health-based violations. 98.0% of systems have at least one violation.

How many people get water from Grayson County systems?

Water systems in Grayson County serve approximately 159,062 people through 50 public water systems.

Has PFAS been detected in Grayson County water?

Under EPA UCMR5, 5 of 8 tested systems in Grayson County had at least one PFAS detection (62.5% of the UCMR5-tested subset - not of all 50 SDWIS systems).

What types of water sources supply Grayson County?

Water systems in Grayson County use GW (33 systems), SW (17 systems) as their primary water sources.

Are health-based violations serious?

Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 30.7% of Grayson County's violations are health-based. Among counties with any SDWIS violations, this extract puts Grayson County in the higher health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

Where does Grayson County sit among U.S. counties for water-system population?

According to EPA SDWIS county population served used on /counties, Grayson County ranks #406 of 3,254 counties by people served, and #33 of 254 counties in Texas. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Texas

Grayson County, Texas

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet TX181 · Grayson County 50 sys · 4,304 viol · #406/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

VIOL-SEVERE 98.0% flagged
HEALTH-MID 30.7% health
RANK-TOP #406/3254
PHOTO-FINISH ±0.1 pp
PFAS-HIGH 62.5% detect
SRC-GW GW lead 66%
SYS-MID 50 systems
BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Williamson County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Grayson County ranks #406 of 3,254 counties by people served, and #33 of 254 counties in Texas. See methodology · corpus placement.

Grayson County standing, mid-flagged corpus third

Flagged-system rate 98.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 30.7% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 62.5% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #406 of 3,254 · #33 of 254 in Texas.

Water Systems

System Name	Population	Violations	PFAS
City of Sherman	43,645	49	Detected
City of Denison	27,500	67	Clean
City of Van Alstyne	7,000	87	Detected
Two Way Sud	6,804	23	Detected
South Grayson Sud	6,750	4	Detected
City of Howe	4,548	111	-
Tanglewood on Texoma	4,341	109	Detected
Luella Sud	4,200	1	Clean
City of Whitesboro	4,192	42	Clean
Kentuckytown WSC	4,083	10	-
Northwest Grayson County Wcid 1	3,615	22	-
Oak Ridge South Gale WSC	3,153	87	-
Starr WSC	3,100	62	-
Pink Hill WSC	2,835	9	-
City of Gunter	2,772	16	-
City of Pottsboro	2,571	24	-
Marilee Elmont	2,448	57	-
Rra Preston Shores Water System	2,277	641	-
City of Bells	2,101	38	-
Sherwood Shores	2,031	12	-
Ridgecrest	1,968	405	-
City of Collinsville	1,866	33	-
City of Dorchester	1,696	8	-
City of Whitewright	1,638	25	-
City of Knollwood	1,353	115	-
City of Tom Bean	1,178	16	-
Grandpappy Point Marina	1,027	43	-
Highport Marina & Resort	1,000	115	-
City of Tioga	938	8	-
Texins Lake Texoma Club	744	20	-
City of Southmayd Westview Subdivision	738	51	-
City of Southmayd	516	87	-
Rock Creek Resort	513	35	-
City of Sadler	483	5	-
Rocky Point Estates	441	65	-
Thompson Heights Water System	414	120	-
Georgetown Baptist Church	400	71	-
Franks Restaurant	315	22	-
Big Mineral Camp Resort	300	5	-
Northern Hills Water Service	264	317	-
Sheppard Afb Recreational Annex	253	14	-
Texoma Estates WSC	216	11	-
Texoma Marina and Resort	180	620	-
Flowing Wells Resort	174	53	-
American Legion Mia Post 231	141	117	-
Heritage Estates	138	72	-
3-D Mobile Home and RV Park	90	90	-
Munson Point Property Owners Association	87	284	-
Twu Water Hauler Pottsboro	25	0	-
Greater Texoma Utility Authority	0	6	-

Compare beyond Texas

Mid-flagged peers for Grayson County

Cross-state counties nearest Grayson County on flagged-system share (98.0%) and cumulative violation count (4,304). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.