Water Quality in Derby, CT 06418
By Alexander Snyder, Founder & Water Quality Data LeadLast reviewed July 2026
The water serving 06418 in Derby has 2 detected contaminants — well below the state average. Fewer detections doesn't necessarily mean safer water; even a single contaminant above health guidelines can pose risks, particularly for infants and immunocompromised individuals. A personalized report shows exactly where your household stands.
Is Derby, CT tap water safe to drink?
Whether Derby tap water is safe depends on your household. 2 contaminants have been detected in ZIP 06418. Federal legal limits and stricter health-based guidelines are not the same thing, and some contaminants matter more for vulnerable groups like infants, pregnancy, and older adults. Enter your ZIP above for a personalized risk assessment.
Get Your Personalized Report
See how 2 contaminants affect your specific household members — babies, children, pregnant women, elderly, dogs, and cats.
Check 06418 Water NowKey Facts About Derby Water
2
substances found in local water testing
11
household member types including pets
What Derby Residents Should Know
Derby's relatively low detection count of 2 is a positive sign, but it's worth checking the specifics. Contaminants like PFAS (forever chemicals) have extremely low health guidelines — parts per trillion — and even one substance above its health guideline can be meaningful. Well water users should also consider geology-based risks for arsenic and radon that may not appear in public system testing.
Contaminants Detected in Derby, CT 06418 Water
Detected in public water testing for ZIP 06418, ranked by how often samples were above the EPA limit. Enforceable health limits are shown in red; secondary (aesthetic) standards like manganese are advisory, not legal limits.
| Contaminant | Detected in | Samples | Exceeds EPA limit | EPA limit |
|---|---|---|---|---|
| NitrateHAS_SAFE_LEVEL | 100% | 94 | No | 10 mg/L as N |
| Nitrate-NitriteHAS_SAFE_LEVEL | 100% | 41 | No | 10 mg/L as N |
Source: EPA SDWIS / UCMR public water testing. Detection and exceedance rates reflect samples in this area; enter your ZIP above for a report personalized to your household. Most recent sample in this area: 2019.
Reading this inside ChatGPT or Claude?
This page can tell you the general science, but not what is actually in your Derby tap water — that depends on your exact address. You can get your specific answer two ways:
- Inside the chat: ask your assistant to “check my tap water with CheckYourTap”. Our connector returns your ZIP code’s measured contaminant levels — including the derived dog and cat safe levels — and, only if you ask it to, can email you the report or arrange a specialist callback.
- On the web: open CheckYourTap.com and enter your ZIP code for a free 30-second report.
Want to know exactly what’s in your Derby water?
2 contaminants have been detected in ZIP 06418. Schedule to get your water tested with a Valiant water specialist — they’ll review your results and arrange testing for your home.
Have a dog or cat in Derby?
2 of the contaminants detected in 06418 have pet-specific concerns — dogs and cats drink far more water per pound of body weight than people, and some are more sensitive. See what they mean for your pet:
Environmental Sites Near Derby, CT 06418
Documented sites in or near this ZIP from EPA and CT DEEP records. These are most relevant for private-well owners as potential groundwater concerns — public water is treated and tested separately. Their presence near a ZIP does not by itself mean your drinking water is affected, but it’s a reason for well owners to test.
Compiled from EPA (SEMS/TRI/ECHO) and CT DEEP records; many are undated historical site inventories. Most recent dated event in this area: 2026-12-31.
Frequently Asked Questions
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Nearby Areas
Related Reading
About This Report
Water quality data for Derby, CT 06418 is compiled from public records filed with the U.S. Environmental Protection Agency (EPA SDWIS), the U.S. Geological Survey (USGS NWIS), and the Connecticut Department of Public Health. Health guidelines reference the strictest available standards from the EWG, California OEHHA, and WHO. Risk assessments are personalized for 11 household member types. CheckYourTap is a service of Valiant Energy Solutions, a Connecticut company established in 1930.
This report is general information, not medical advice or a substitute for certified laboratory testing. Talk to your pediatrician or physician about specific health concerns.
By Alexander Snyder, Founder & Water Quality Data Lead. Last updated July 2026