How many water violations are in Denton County?

Denton County has 10,762 total drinking water violations across 98 water systems, of which 224 are health-based violations. 95.9% of systems have at least one violation.

How many people get water from Denton County systems?

Water systems in Denton County serve approximately 811,262 people through 98 public water systems.

Has PFAS been detected in Denton County water?

Under EPA UCMR5, 20 of 27 tested systems in Denton County had at least one PFAS detection (74.1% of the UCMR5-tested subset - not of all 98 SDWIS systems).

What types of water sources supply Denton County?

Water systems in Denton County use GW (68 systems), SW (30 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. 2.1% of Denton County's violations are health-based. Among counties with any SDWIS violations, this extract puts Denton County in the lower health-based share band. Not all violations indicate immediate health risk, but they require corrective action.

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

According to EPA SDWIS county population served used on /counties, Denton County ranks #78 of 3,254 counties by people served, and #10 of 254 counties in Texas. Ordinals use the same total_population DESC sort as the counties directory. See /methodology#corpus-placement.

Counties → Texas

Denton County, Texas

Compiled by PlainWater · May 15, 2026

SDWIS compliance plate

Sheet TX121 · Denton County 98 sys · 10,762 viol · #78/3254

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

VIOL-SEVERE 95.9% flagged
HEALTH-LOW 2.1% health
RANK-TOP #78/3254
PHOTO-FINISH ±0.1 pp
PFAS-HIGH 74.1% detect
SRC-GW GW lead 69%
SYS-MID 98 systems
BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Denton County ranks #78 of 3,254 counties by people served, and #10 of 254 counties in Texas. See methodology · corpus placement.

Denton County standing, mid-flagged corpus third

Flagged-system rate 95.9% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 2.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 74.1% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #78 of 3,254 · #10 of 254 in Texas.

Water Systems

System Name	Population	Violations	PFAS
City of Denton	150,037	13	Detected
City of Lewisville	140,880	0	Detected
Mustang Sud	110,826	48	Detected
Town of Flower Mound	80,000	34	Detected
City of the Colony	45,367	11	Detected
Town of Little Elm	41,000	6	Detected
City of Corinth	23,213	46	Detected
Lake Cities Municipal Utility Authority	17,826	13	Detected
City of Highland Village	16,500	25	Detected
Trophy Club MUD 1	13,649	1	Clean
Denton County Fwsd 7	13,325	37	Detected
Argyle WSC	12,720	36	Detected
Bolivar WSC	11,901	33	Clean
Town of Northlake	10,430	23	Detected
City of Roanoke	10,127	87	Detected
City of Sanger	9,650	42	Detected
Cross Timbers WSC	8,751	35	Detected
City of Pilot Point	7,836	22	Clean
Town of Providence Village	7,128	57	Clean
City of Krum	6,062	88	Clean
Frisco West Wcid	5,805	52	Detected
Denton County Fwsd 11-A	5,160	14	Detected
Elm Ridge Wcid	5,061	38	Detected
City of Justin	4,409	24	Detected
City of Aubrey	4,058	116	-
Tpwd Ray Roberts Lake Isle Dubois	4,056	19	-
Denton County Fwsd 11-B	3,897	8	-
Denton County Fwsd 8-B	3,090	21	-
City of Hackberry	2,979	84	Detected
Denton County Fwsd 8-A	2,955	18	-
Town of Ponder	2,711	30	-
Hilltown Addition	2,184	173	-
Denton County Fwsd 11-C	1,977	11	-
Creekside Water System	1,749	71	-
Black Rock WSC	1,680	75	-
Trail Creek Water System	1,509	31	-
Shale Creek Community	1,470	1	-
Foxbane Combined WS	1,455	114	-
Vacation Village	1,140	51	-
South Fork Mobile Home Park	1,050	45	-
Green Springs WSC	858	195	-
Longhorn Meadows Addition	855	10	-
Big Sky MUD	813	3	-
Camp Copass	800	114	-
Town of Lakewood Village	795	158	-
Wren Water System	759	17	-
Stony Hills Water System	723	19	-
Cinnamon Ridge	501	6	-
Saratoga Estates	483	28	-
Wynnwood Haven Estates	459	15	-

Compare beyond Texas

Mid-flagged peers for Denton County

Cross-state counties nearest Denton County on flagged-system share (95.9%) and cumulative violation count (10,762). 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.