Non-Transient Non-Community Water System · PWS AZ0407072
Taliesin West
Operator location Scottsdale, Arizona - smaller served population (≤ 999) at 85 people served; 199 SDWIS violations on record from groundwater sources.
- 85
- People served (this PWS)
- 199
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Taliesin West standing, high SDWIS violation third
85 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%).
The verdict
Taliesin West sits in the upper third of the sitemap cohort by violation count (199), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (85; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 199
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
- 85
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Public/Private
- Connections
- 1
- County
- Maricopa
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 147
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 35 | 2021 |
| Coliform (TCR) | MR | 27 | 2014 |
| Lead and Copper Rule | MR | 20 | 2025 |
| Consumer Confidence Rule | Other | 12 | 2009 |
| Arsenic | MR | 11 | 2014 |
| Arsenic | MCL | 6 | 2010 |
| Nitrate | MR | 5 | 2005 |
| TTHM | MR | 5 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2012 |
| LEAD AND COPPER RULE REVISIONS | TT | 4 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2024 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2003 |
| Public Notice | Other | 2 | 2024 |
| Revised Total Coliform Rule | RPT | 2 | 2022 |
| DICHLOROMETHANE | MR | 1 | 1998 |
| 1,1,2-Trichloroethane | MR | 1 | 1998 |
| Endrin | MR | 1 | 1998 |
| BHC-GAMMA | MR | 1 | 1998 |
| Methoxychlor | MR | 1 | 1998 |
| Dalapon | MR | 1 | 1998 |
| Diquat | MR | 1 | 1998 |
| Endothall | MR | 1 | 1998 |
| Di(2-ethylhexyl) adipate | MR | 1 | 1998 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 1998 |
| Dinoseb | MR | 1 | 1998 |
| Hexachlorocyclopentadiene | MR | 1 | 1998 |
| Carbofuran | MR | 1 | 1998 |
| Atrazine | MR | 1 | 1998 |
| Heptachlor | MR | 1 | 1998 |
| Heptachlor epoxide | MR | 1 | 1998 |
Violation Count vs. the National Corpus
Taliesin West has 199 recorded EPA violations, 85% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 15% carry more. 5% of this system's own violations are health-based (10 of 199), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
199 Higher than most more violations than 85% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Population served record for Taliesin West
EPA SDWIS lists 85 people served and 1 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
199 violations · 85 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Taliesin West
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Arizona compares on the same EPA violation measures. Arizona systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.