Is Denton, TX tap water safe?
Supplied by City of Denton · serves 150,037 people (58,289 connections) · Surface water · EPA ID TX0610002
Data: U.S. EPA · How we read the data · How we check it
Most of Denton gets its water from City of Denton. Parts of the city are served by 3 smaller systems: Bryan County Rws & Swmd #2 (6,270 people), Woodland Hills Water System (114 people), Mullins Mobile Home Park Water System (87 people). Your water bill names your system.
Summary
No federal limits exceeded in EPA data.
- PFAS
- Detected, below limit4 of 29 PFAS found at least once. All averages below the federal limits.
- Lead
- Below action level1.5 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Jun 2024. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read City of Denton's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (940) 349-7717. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 2 entry points tested Jan 2023 to Oct 2023. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Detected, below limit Limit 1 | 0.0015 |
| PFBS Detected, below limit Guideline 2,000 ppt | 2.95 ppt |
| PFBA Detected, below limit Guideline 6,000 ppt | 7.2 ppt |
| PFHxA Detected, below limit Guideline 3,000 ppt | 5.15 ppt |
| PFPeA Detected, no limit | 4.68 ppt |
29 PFAS tested, 4 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 1 of 8 samples. Highest result 10.1 ppb. EPA's non-enforceable screening level is 10 ppb. Below screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 1.5 ppb lead (Jan 2024 – Jun 2024). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2024 – Jun 2024 | 1.5 ppb |
| Jul 2023 – Dec 2023 | 1.2 ppb |
| Jan 2020 – Dec 2022 | 1.4 ppb |
Earlier results (9)
| Jan 2017 – Dec 2019 | 1.2 ppb |
| Jan 2016 – Dec 2016 | 1 ppb |
| Jan 2010 – Dec 2012 | 1.68 ppb |
| Jan 2007 – Dec 2009 | 2.42 ppb |
| Jan 2004 – Dec 2006 | 2 ppb |
| Jan 2001 – Dec 2003 | 1.8 ppb |
| Jan 1998 – Dec 2000 | 2.2 ppb |
| Jan 1995 – Dec 1997 | 2.2 ppb |
| Jan 1994 – Dec 1994 | 2.6 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 38.3 ppb | 300 ppb |
| Strontium | 0.35 ppm | 1.5 ppm |
| Molybdenum | 2.04 ppb | 40 ppb |
| Chlorate | 440 ppb | 210 ppb |
| Chromium-6 | 0.066 ppb | – |
Where it serves
Denton
ZIP codes the system reported serving: 76201, 76202, 76203, 76204, 76205, 76206, 76207, 76208, 76209, 76210, 76226, 76227, 76249, 76266
Nearby utilities
- Town of Flower Mound Flower Mound · 12 mi
- City of Lewisville Lewisville · 15 mi
- City of Frisco Frisco · 19 mi
- City of Grapevine Grapevine · 20 mi
- City of Celina Celina · 21 mi
- Mustang Special Utility District Celina · 21 mi
Questions
Is Denton tap water safe to drink?
Most of Denton gets its water from City of Denton. City of Denton has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Denton water have PFAS?
Yes. EPA's 2023–2025 testing of City of Denton found 4 PFAS at least once. None of the averages were above the federal limits.
What is the lead level in Denton water?
The most recent 90th-percentile lead result for City of Denton is 1.5 ppb, for the period ending Jun 2024. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for TX0610002: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID TX0610002).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask City of Denton at (940) 349-7717, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.