Water Quality in Leander, TX: 66 Violations — Grade B
Grade B · Score 74/100 · 3 water systems · Updated 2026-05-03
Leander's water is mostly safe. Minor violations exist but are primarily monitoring-related.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Compliance records maintained by the EPA for Leander, TX log 66 violations — accumulated reportable events drawn from every local utility in the SDWIS national tracking system.
Water Quality by ZIP Code in Leander
Water quality varies across Leander's 3 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 78641 | B | 71 | 22 | 0 | View report → |
| 78645 | B | 71 | 22 | 0 | View report → |
| 78646 | B | 81 | 22 | 0 | View report → |
Violation Trend
EPA violations recorded for water systems serving Leander.
Water Quality Overview
Leander, Texas receives a water quality grade of B with an overall score of 74 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Leander have accumulated 66 EPA violations (all monitoring/reporting type). These violations are tracked across 3 ZIP codes serving approximately 105,038 people.
What Grade B Means
A grade of B indicates good compliance with EPA drinking water standards. While not perfect, Leander's water systems meet the vast majority of federal requirements. Minor violations may exist but typically relate to monitoring or reporting rather than health-based standards.
Lead Levels
The average 90th percentile lead level across Leander water systems is 0.0020 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
Water Systems Serving Leander
Leander is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 105,038 people across 3 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 30 enforcement actions against water systems serving Leander. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Leander
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Leander Water Systems
The following contaminants have been detected or caused violations across Leander's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Lead and Copper Rule | Treatment Technique | N/A | 24 | 3 | No |
| Revised Total Coliform Rule | Microbiological | N/A | 12 | 3 | No |
| Gross Beta | Radionuclides | 50 pCi/L | 12 | 3 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 6 | 3 | No |
| Total Organic Carbon | Disinfection Byproducts | N/A | 3 | 3 | No |
| Chlorate | Disinfection Byproducts | N/A | 3 | 3 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 3 | 3 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 3 | 3 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Leander:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2024 | 3 | 3 |
| 2025 | 3 | 3 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Leander. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-03 | State Informal Action |
| 2025-07-23 | State Informal Action |
| 2025-07-23 | State Informal Enforcement |
| 2025-07-18 | State Informal Action |
| 2025-07-18 | State Informal Enforcement |
| 2025-07-10 | State Order Extension |
| 2025-07-09 | State Order Extension |
| 2025-07-08 | State Informal Action |
| 2025-07-08 | State Informal Enforcement |
| 2025-05-28 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-03.
Leander vs. Nearby Texas Cities
How Leander's water quality compares to similar cities in Texas:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Leander | B | 66 | 3 | 105,038 |
| Allen | A | 0 | 1 | 104,870 |
| Veribest | C | 0 | 1 | 105,229 |
| Millican | C | 0 | 1 | 104,103 |
Recommended Water Filters for Leander
Based on contaminants detected in Leander's water supply, these filter types are recommended:
Granular Activated Carbon (GAC, whole-house or under-sink)
- Removes: Chlorine
- Effectiveness: 95-99%
- Cost range: $100–$600
- Certification: NSF/ANSI 42
- Recommended products:
- Aquasana AQ-5200
- Waterdrop Chubby Pitcher
- Berkey Travel
Water Quality by ZIP Code in Leander
Water quality varies across Leander's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
Common Questions About Leander Water
These are the most common questions residents search for about water quality in Leander, Texas:
Is Leander water hard or soft? Water hardness varies by source. Leander's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Leander tap water? Leander's water receives a grade of B (74/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Leander? Based on detected contaminants, a granular activated carbon (gac, whole-house or under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.
Leander vs. Texas Average
Understanding how Leander compares to the broader Texas average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Leander.
ZIP Codes in Leander
Leander spans 3 ZIP codes. The ZIP with the lowest water quality score is 78641. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade B is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.