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Denton County, TX Water Quality

Water quality data for 28 public water systems serving Denton County, Texas — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 28 water systems · 36 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Denton County Earns a A

Denton County: 36 communities across 28 water systems. 100.0% have no open violations.

  • Median lead where detected: 1.41 ppb
  • 24 communities with a lead detection, 12 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
1.41 ppb
Median Lead Level
County-wide, 90th percentile
28
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Denton
    1.50 ppb
    No federal limits exceeded on record
    A
  • Carrollton
    Not detected
    No federal limits exceeded on record
    A
  • Lewisville
    Not detected
    No federal limits exceeded on record
    A
  • Flower Mound
    1.60 ppb
    No federal limits exceeded on record
    A
  • Little Elm
    2.17 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • The Colony
    0.62 ppb
    1 significant inspection deficiency
    A
  • Sanger
    5.35 ppb
    Lead at 5.35 ppb, above a third of the action level
    A
  • Roanoke
    1.28 ppb
    1 health-based violation since 2015
    A
  • Lakewood Village
    Not detected
    1 health-based violation since 2015
    B
  • Denton
    1.50 ppb
    No federal limits exceeded on record
    A
County Lead Level — Median 1.41 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.41 ppb — 9.4% of the federal action level
Systems by Lead Level
Under 5 ppb
23
5 – 10 ppb
1
No Data
12

All Cities in Denton County

Denton 1.50 ppb A
Carrollton Not detected A
Lewisville Not detected A
Flower Mound 1.60 ppb A
The Colony 0.62 ppb A
Little Elm 2.17 ppb A
Corinth 1.00 ppb A
Highland Village 2.62 ppb A
Lantana 1.30 ppb A
Roanoke 1.28 ppb A
Trophy Club Not detected B
Sanger 5.35 ppb A
Lake Dallas 2.21 ppb A
Savannah 1.33 ppb A
Providence Village 1.29 ppb A
Krum 4.90 ppb A
Paloma Creek South 1.75 ppb A
Northlake Not detected B
Argyle 1.67 ppb A
Hickory Creek 2.21 ppb A
Justin Not detected A
Pilot Point Not detected A
Oak Point 1.33 ppb A
Aubrey Not detected B
Paloma Creek 1.49 ppb B
Double Oak 1.15 ppb A
Hackberry Not detected A
Ponder Not detected B
Shady Shores 2.21 ppb A
Krugerville 1.33 ppb A
Cross Roads 1.33 ppb A
Copper Canyon 1.15 ppb A
Bartonville 1.15 ppb A
Hebron Not detected A
Lakewood Village Not detected B
DISH Not detected B
Showing 36 cities
No active violations Active violations

About Denton County Drinking Water

Denton County is served by 28 water systems covering 36 communities. No community here has an open violation on record.

Of the communities reporting lead results, 24 recorded a detection, with a median of 1.41 ppb — 9% of the federal action level. 12 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 1 of them.

Frequently Asked Questions

Is Denton County tap water safe to drink?▼
No community in Denton County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Denton County?▼
Among communities with a detection the median is 1.41 ppb, 9% of the 15 ppb action level. 12 reported none detected and 0 reported no result.
How many water systems serve Denton County?▼
28 community water systems serve 36 communities here.
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