PROJECT ABACUSENVIRONMENTAL DATA

Bear Tavern School

PFAS monitoring results for a public water system in New Jersey

NJ1106316UCMR 5EPA monitoring data
14.7Highest PFOA result, ppt
38.1Highest PFOS result, ppt
0.97Highest Hazard Index
60Results
PWSID
NJ1106316
State
New Jersey
System type
non-transient non-community water system (NTNCWS)
Population served
555
City
Pennington
Counties
Mercer County
Primary source water
groundwater
UCMR 5 sampling
2023-01-25 to 2023-07-18 · 1 entry point(s) · water types: GW
Service-area boundary
parcel-based (EPA non-community layer)

PFOS ≥ 3 × its limit highest single result
PFOS ≥ 3 × its limit worst entry-point average

Open on the New Jersey map · All New Jersey systems · All results

These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.

Compared with EPA's 2024 values

Highest single resultWorst entry-point average*Limit
PFOA (ppt)14.77.354
PFOS (ppt)38.123.84
Hazard Index0.970.4851.0†

“<MRL” = every result for the compound was below its reporting limit. * Mean of all samples at each entry point with non-detects = 0 (EPA compliance convention; the Hazard Index also uses non-detects = 0); a screening comparison, not a formal running annual average. † Rescission proposed May 2026. PFOA/PFOS MCL 4 ppt (2024 NPDWR, in effect). PFHxS, PFNA, HFPO-DA (10 ppt each) and the Hazard Index (1.0) are 2024 NPDWR values; EPA proposed rescinding them on 18 May 2026 (comment period closed 20 Jul 2026).

Compared with New Jersey standards

Highest single resultWorst entry-point average*New Jersey
PFNA (ppt)6.53.2513
PFOA (ppt)14.77.3514
PFOS (ppt)38.123.813

Sum standards add the listed compounds within each sample (non-detects = 0). State compliance is normally judged on averages over time; these are screening comparisons.

Sampling history

Sampled 2023-01-25 to 2023-07-18 · 1 entry point(s) · water types: GW · 2 sampling visits. PFAS in ppt (ng/L).

DateEntry pointEventPFOAPFOSHIOther detections
2023-01-25BEAR TAVERN SCHOOL (GW)SE1<49.50PFBA 15, PFHxA 3.2, PFPeA 4.1, lithium 17.9 µg/L
2023-07-18BEAR TAVERN SCHOOL (GW)SE214.738.10.97PFBA 14.2, PFHpA 6, PFHxA 10.3, PFPeA 13.8, lithium 15.6 µg/L

“<4” = not detected at the reporting limit shown; “n/a” = not analyzed in that sample. Highlighted = at or above the 4 ppt MCL. HI computed per sample with non-detects as 0. Other detections lists every other quantified compound (lithium in µg/L).

All results by entry point

60 results. Each column is one sampling visit (date and UCMR 5 sample event). A number is a measured concentration; “< 4” = below the minimum reporting level shown; “–” = not analyzed in that visit. PFAS in ppt (ng/L); lithium in µg/L.

BEAR TAVERN SCHOOL facility TP001001 · sample point TP001001 · groundwater

CompoundMRL2023-01-25
SE1		2023-07-18
SE2
PFBA5 ppt1514.2
PFHpA3 ppt< 36
PFHxA3 ppt3.210.3
PFHxS3 ppt< 33.2
PFNA4 ppt< 46.5
PFOA4 ppt< 414.7
PFOS4 ppt9.538.1
PFPeA3 ppt4.113.8
11Cl-PF3OUdS5 ppt< 5< 5
4:2 FTS3 ppt< 3< 3
6:2 FTS5 ppt< 5< 5
8:2 FTS5 ppt< 5< 5
9Cl-PF3ONS2 ppt< 2< 2
ADONA3 ppt< 3< 3
HFPO-DA5 ppt< 5< 5
NEtFOSAA5 ppt< 5< 5
NFDHA20 ppt< 20< 20
NMeFOSAA6 ppt< 6< 6
PFBS3 ppt< 3< 3
PFDA3 ppt< 3< 3
PFDoA3 ppt< 3< 3
PFEESA3 ppt< 3< 3
PFHpS3 ppt< 3< 3
PFMBA3 ppt< 3< 3
PFMPA4 ppt< 4< 4
PFPeS4 ppt< 4< 4
PFTA8 ppt< 8< 8
PFTrDA7 ppt< 7< 7
PFUnA2 ppt< 2< 2
lithium9 µg/L17.915.6

Statistics by compound

CompoundResultsDetectedHighest (date)Mean boundsKM medianP75P90P95
PFBA2100%15
2023-01-25		14.6–14.6fewer than 4 results: raw values only
PFHxA2100%10.3
2023-07-18		6.75–6.75fewer than 4 results: raw values only
PFOS2100%38.1
2023-07-18		23.8–23.8fewer than 4 results: raw values only
PFPeA2100%13.8
2023-07-18		8.95–8.95fewer than 4 results: raw values only
lithium2100%17.9
2023-01-25		16.75–16.75fewer than 4 results: raw values only
PFHpA250%6
2023-07-18		3–4.5fewer than 4 results: raw values only
PFHxS250%3.2
2023-07-18		1.6–3.1fewer than 4 results: raw values only
PFNA250%6.5
2023-07-18		3.25–5.25fewer than 4 results: raw values only
PFOA250%14.7
2023-07-18		7.35–9.35fewer than 4 results: raw values only

Never detected (21): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFBS, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, PFPeS, PFTA, PFTrDA, PFUnA.

Left-censored Kaplan–Meier statistics (Helsel 2005; Helsel & Lee 2006, NADA for R). Units: ppt; lithium µg/L. Each compound has one reporting limit, so the Kaplan–Meier mean equals the upper mean bound (non-detects at the MRL); the lower bound sets non-detects to 0. “<MRL” = the percentile falls below the reporting limit and cannot be estimated. These describe this system's UCMR 5 samples, not population estimates.

Sources

  • EPA UCMR 5 occurrence data text files (UCMR5_All.txt; samples 2023-01-09 to 2026-05-29; data summary dated Jul 2026)
  • EPA SDWIS via ECHO SDWA downloads, quarter 2026Q3
  • EPA Public Water System Service Areas v3 (Mar 2026)
  • US Census Bureau cartographic boundary counties 1:500k, 2024
  • EPA/USGS NHDPlus V2 (medium resolution) flowlines, Strahler order 2+

Data build 0c4398dd12d6 · 2026-10-18T04:09Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.