Is Derby, KS tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for City of Derby.
2 public water systems serve parts of Derby. The largest, City of Derby, serves 25,413 people. Your water bill names your system.
Largest system
City of Derby
25,413 people · Purchased surface water · EPA ID KS2017328
Buys treated water from City of Wichita.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 1.3 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Across Kansas, 3 of 102 water systems EPA tested had PFAS above a 2024 federal limit, and 3 systems were above the lead action level in results from the last five years. Kansas results.
Derby homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Derby city (tables B25034, B25003). Estimates for small places have a margin of error.
Other water systems serving Derby
- Sedgwick County Rural Water District 36,045 people · Purchased surface water · Kansas · lists this cityLithium above screening level
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Wichita 10 mi City of Wichita | None above limits | 1.42 ppb |
| Hutchinson 50 mi City of Hutchinson | None above limits | 0 ppb |
| Salina 89 mi City of Salina | None above limits | 1.4 ppb |
| Manhattan 118 mi City of Manhattan | None above limits | 0.8 ppb |
| Topeka 133 mi City of Topeka | None above limits | 1.4 ppb |
| Lawrence 146 mi City of Lawrence | None above limits | 3 ppb |
Derby ZIP codes (1)
- 67037
Questions
Is Derby tap water safe to drink?
City of Derby has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Derby, KS?
2 public water systems serve parts of Derby. The largest is City of Derby (25,413 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does Derby tap water have PFAS?
None detected above EPA's reporting limits. City of Derby had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Derby homes have lead pipes?
Census estimates put 32% of Derby homes as built before 1980 (Kansas: 56%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of Derby's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.