Question 1

Is Andrade Border Station water safe to drink?

Accepted Answer

Andrade Border Station (PWS ID: 090400678) has 216 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 647 people using Groundwater sources.

Question 2

How many people does Andrade Border Station serve?

Accepted Answer

EPA SDWIS reports that Andrade Border Station serves 647 people (this public water system's service population, not the municipal population of Calexico or any other city). It is a Federal-owned system using Groundwater water sources with 3 service connections. The operator address is listed in Calexico, EPA Region 9 — Tribal Water Systems.

Question 3

What type of violations does Andrade Border Station have?

Accepted Answer

Andrade Border Station has 216 total violations: 5 health-based violations (MCL exceedances or treatment failures), 190 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Andrade Border Station water?

Accepted Answer

No PFAS testing data is available for Andrade Border Station under the EPA's UCMR5 monitoring program.

Question 5

What water source does Andrade Border Station use?

Accepted Answer

Andrade Border Station uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.

Question 6

Where does this data come from?

Accepted Answer

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Question 7

Where does Andrade Border Station sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Andrade Border Station ranks #25,387 of 29,740 by people served, and #111 of 129 in EPA Region 9 — Tribal Water Systems. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Andrade Border Station's violation count compare nationally?

Accepted Answer

Andrade Border Station has 216 recorded EPA SDWIS violations, fewer than 14% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 86% of that cohort has fewer violations than Andrade Border Station. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	36	2015
Nitrate	MR	8	2022
Thallium, Total	MR	7	2017
TTHM	MR	5	2013
Total Haloacetic Acids (HAA5)	MR	4	2013
Revised Total Coliform Rule	RPT	4	2025
Beryllium, Total	MR	3	2018
Endrin	MR	3	2020
Methoxychlor	MR	3	2020
Toxaphene	MR	3	2020
Dalapon	MR	3	2020
Diquat	MR	3	2020
Glyphosate	MR	3	2020
Di(2-ethylhexyl) adipate	MR	3	2020
Di(2-ethylhexyl) phthalate	MR	3	2020
Picloram	MR	3	2020
Dinoseb	MR	3	2020
Carbofuran	MR	3	2020
Atrazine	MR	3	2020
LASSO	MR	3	2020
2,3,7,8-TCDD	MR	3	2020
Heptachlor epoxide	MR	3	2020
2,4-D	MR	3	2020
2,4,5-TP	MR	3	2020
HEXACHLOROBENZENE	MR	3	2020
Benzo(a)pyrene	MR	3	2020
Pentachlorophenol	MR	3	2020
Total Polychlorinated Biphenyls (PCB)	MR	3	2020
1,2-DIBROMO-3-CHLOROPROPANE	MR	3	2020
ETHYLENE DIBROMIDE	MR	3	2020

Andrade Border Station

Andrade Border Station standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Andrade Border Station

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems with smaller service footprints